No, we already entered the current PC gaming golden age around the end of 2013 and beginning of 2014
And the most important point of it for me is one you don't mention:
- A return to form for classic PC genres such as (above all) CRPGs, but also P&C adventures, space sims, building games, 4x, etc.
Seems like everyone's got their own timescale. However, this is the one I agree with because it's when PC gaming gained traction in a way it hasnt for at least 2 generations of consoles (correct me if I'm wrong).
IMO this heading towards the peak (or close to it) considering the points OP has mentioned, notably the Steam Controller and Steam refunds making sure devs can't do shitty ports and call it a day anymore. Even EA's Origins is getting better (does GAF hate it? Cos I kind of like it now).
I hope MS pushes Xbox exclusives forward to PC gaming like theyve done with Ryse and Killer Instinct so far.