Those Bonk RPG mockups were pretty cool at the time. What I’ve heard since is that the project was never even really started in earnest and was still in the stage where Hudson was deciding if it was something they wanted to do. But given that other platforms have made the jump to RPGs, I don’t see why Bonk couldn’t, except that I’m not sure compelling story or dialogue would come out of the Bonk property. Which is to say it could make a mechanically interesting RPG sort of like the Mario RPGs, but story-wise it would likely be a dud without Hudson seriously expanding the universe and ensuring there is always a character to speak for Bonk (who should probably always be non-verbal, not simply silent).