It’s a good idea, and I bet it could sell some units.
I just think that when Ron Gilbert says the tools at hand are not good enough, he means they’re not good enough for a seasoned veteran with a mind of his own. Younger developers may not experience the ‘problems’ he has with the existing tools, because they’re not used to programming their own code.
Mind you, I think if the price tag is good a name like Ron Gilbert (or Tim Shafer erc.)could outsell all other Adventure Game tools on the market. But I still think it would be to great a hassle for them.
In their heart, I think they’re storytellers, and the tools they create are made for telling their story’s, that’s where their focus lies.