I believe Legendary Games is planning to make PF 1.5 or basically a "fixed" version of Pathfinder / 3.5e
I'm very interested to see how this goes.
But I do think there is a lot of difference here. When PF came along as a 3X clone there was intense love of 3X still around and a lot of dissatisfaction with 4E, without a great alternative.
There are a ton of great alternatives now and that is without even accounting for 5E. And the market demand for PF1E in 2020 is nothing compared to the demand for 3X in 2009.
PF needed to be replaced. And a tune-up isn't going to change that given all the changes that have occurred in the industry in the past decade.
That said: look at it from Legendary's point of view. They are a small label and they were doing "fine" selling PF 3PP (amongst other stuff).
I don't think 3PP for either PF or PF2E is flying off virtual shelves these days. But if you look through Kickstarters which offered both, PF consistently moves more units that PF2E. (FWIW, I think the reality is that some reasonable number of people are
PLAYING PF with their book they have had for years. So the pool of buyers is there, but I also think PF players, taken as a group, are more inclined to buy 3PP stuff than PF2E players. So it is tough to truly read anything meaningful into that data with regard to overall fanbase.) So I think a PF tune up is likely to be a potential big seller in the context of Legendary Games.
It may sound like a double standard on my part that I am giving the PF tune up a pass here.
But that is because
it is a double standard on my part.
PF2E had the potential from a marketing point of view to be way more than it has achieved. Neither PF nor any tune-up has that same potential at this point in the market.