I feel like this is a game and concept that would do well on mobile, I'm not surprised they're trying.
Personally I was never into RCT, though. I don't know how many fans actually exist that would buy a new full price release.
You'd be surprised. There are still a lot of people to this day who continue to make mods and custom scenery for RCT3. Hell, the game got it's biggest mod ever with the creation of CT just last year. It's a very popular series and a lot of people out there would be ecstatic to see a PC version.