I don't see anyway else to address other than saying that I don't think it'll be more than a simple port, as I see no reason for it to be more than a definitive port with all DLC included with some degree of visual and a performance upgrades. The development cycle on the game is, as far as we know, done. I've already given multiple reasons why they would just do a simple port of the game in previous posts (which you side-stepped addressing) as opposed to turning Smash into a service randomly.
Honestly, you really haven't given much to back up your point of why you even think this. As far as I can tell, your only real point is that Smash 4 took a lot of effort, so they aren't going to do a Smash 5. And people will feel "burned" by a full sequel, despite the fact that Smash 4 is already nearly 2 years old anyway. I don't know, I'm not seeing where you're coming from at all.
I'm not sure how to respond to this, really...
I mean, if you're not seing why Nintendo investing a ton of R&D, budget, and physical capital (on Sakurai's part), Sakurai openly expressing that he's getting old, can't work on the series forever, and the sheer amount of content both at and post-launch, plus himself expressing how much he dislikes starting from scratch each time because it's such a waste of time from a development point of view and leads to popular things getting cut
miiight be putting the state of this model into question a bit, then to be honest I really have no idea what to say. Sure, they could ignore that and press on, but I just don't think that'd be smart considering how long that'd take compared to just working with what they have. I simply think it's best for the series to evolve instead of thinking they have to waste time and resources reinventing the wheel every time, and there are reasons I believe that.
Let me try and find another analogy... Compare Square Enix's woes last gen (major JP devs in general, actually...) when they insisted on starting from scratch and developing FFXIII and Versus XIII with their own custom engine, to now when they're just doing everything in Unreal. Which worked out better for them in terms of public perception and the ability to put out games on a reasonable timeframe? Or Capcom's great success last gen doing everything on MT Framework, compared to this gen where insisting on hitting reset with Panta Rhei has crippled their output.
Not the best but it gives the idea across that in game development, it's better to work with an established framework than hit reset every time.
I think a totally ground-up new Smash game would be great. I just don't think it's feasible at this point to have it out within the next few years, or necessarily the thing that will work best considering how much work they'd be throwing out only to do over all again - a nightmare in the HD development sphere.