The sad truth is that there ISN'T any real replacement, just as there wasn't any real replacement for flash. People just...stopped making games in the niche flash allowed for once it disappeared. Godot, GameMaker and others are more full-fledged, generalized development platforms. You CAN make an RPG in them, but you'll spend an enormous amount of extra time doing so, because you've got to re-invent the damn wheel on EVERYTHING. RPGMaker is what it says on the tin: A simple tool to make RPGs. All the basics are already in place, zero effort needed. You just tweak things and go.