60fps on console wasn't even the focus lol, quite the opposite. The idea was maxing out the cpu on 30fps games making it very hard for PCs to double the frame rate.
Which is what I just touched on. That isn't always going to be the case. It depends on the game, the developer, and whether they feel like (or want to, have time, etc) a PC port would be reworked to handle resources in a different manner. A CPU maxed game at 30FPS on a console isn't always going to translate to needing double the CPU power to hit above 60FPS on a PC. A likely scenario where it
would is when the port is more direct, and by that I mean only the minimum changes required for it to run on this platform, or that one, are put into place. Where it wouldn't be required is, like I said, when the PC port comes out later because they wanted to rework the way the game operates on PC versus on a console. Either offloading more onto what they know are the available GPUs, etc as an example. The game can be specifically tailored in one way because all the PS5s are the same, but with the variable PC hardware, adjustments can be made where if user "X" has such and such GPU, then the software can leverage that in lieu of simply saturating the CPU or the GPU in the same manner as the console build. Of course as we know and have seen, some devs claim they do that for a PC port and it ends up not being true which is evident when people play the game and realize something is wrong.
Not every dev has the time or resources to do that however (ports that play to the strengths and differences of platforms) which is why I'm saying this won't always be the case. Some need the game out on all the platforms in close proximity and we run into possible performance issues not just between PC and console, but between console and console. Others farm out the work to another dev to ensure that version of the game is tailored to whatever platform (Black Ops 4 is a recent example that I recall), and then you have some that decide to push back other platforms till later because they intend to do the optimization work themselves.
Again, the point I'm making is that it isn't a universal rule,
not that it never applies because there are a myriad of examples of both. That's also why I clarified in my edit above that I should have said "That isn't how it
always works.." because that is what I'm communicating here which isn't intended to be condescending as I said, or even raise an argument; I'm pointing out how we cannot use that as a universal rule.
Even among those of us who play on PC, a good general rule of thumb is to not let your CPU, or GPU upgrades languish because there are those situations where you play a game that favors one over the other and you could end up screwed. Going back to what you are saying about needing double the CPU; considering that the baseline is being raised from the lowly Jaguar to a Zen 2, then yeah, those people who, for example, buy some old cheap Inspiron off Ebay, slap a decent GPU in, and enjoy great performance are going to find that to be less the case as the upcoming gen moves forward and matures. I'm not even disputing that because I, for one, rather like that such a baseline is being dropped. However, for good rigs (and ignoring upcoming PC parts and hardware for the sake of discussing the here and now), it's going to be a variable situation. Some games will need something like that, sure, others will end up being tailored otherwise and it won't be a 1:1 case.
TL;DR
Taking a 30 FPS, CPU-saturated next gen console game and doubling the performance on a PC:
1. Non-PC optmized port: Very unlikely or just a flat-out "No" until hardware that can brute force the gains is available.
2. Budget rigs: Unlikely
even with optimized ports. The key here is that the baseline has made it's first appreciable step forward for the first time in what feels like a very long time. (Zen2) I don't want to insult people who buy cheap rigs and slap good GPUs in them, but the fact is that things are moving forward and that's a good thing. I'm not hand waiving the frustration of having to pay even more money to stay in the game; I'm just simply pointing out what is happening here.
3. Power rig: Depends on the port and if the developers make changes to account for available PC hardware strengths the PS5 doesn't have. (Like a more powerful GPU than whatever the PS5 uses.) As mentioned above, this can either be difficult with a non-optimized port where the brute force is needed (this method gets easier as time goes on and better hardware is available), or you have the optimized ports that account for the differences in a PC and the goal of having double performance or frame rate is far more feasible. (30fps to 60fps or beyond.)