I've only ever fooled around with RPGMaker; I've never spent a great deal of time with it. But the biggest issue is probably that it's a product of its time, and that was a time long before iOS and Android. RPGMaker executables
can be ported to mobile platforms, but the process is wonky, and the total addressable gaming base is very small.
And in a lot of ways, the audience was always small, even in RPGMaker's prime. To me, that was the biggest setback. If I was going to pour 100+ hours into making a game, I would have wanted people to play it. Preferably, a lot of people, but even some would have been fine. That just never seemed to be a likely possibility.
In theory, this project will make RPGMaker games more easily playable on all platforms, and thus more accessible. So that's a worthy goal. I don't think you'd be able to make modern games on RPGMaker 2000/3. But you could make a respectable, if rustic take on the 16-bit-era RPG. And maybe you could find a small, but passionate userbase for it.
I wouldn't labor with RPGMaker under the assumption that you're building the Next Big Game. But if you're doing it to make passion projects or hobby games? Sure.