If Commodore hadn't tanked, they would likely rule the console game market. Instead of XBOX and PS3 we'd have the Amiga CD128 console (DVD128?).
The remaining line of Amiga computers would be high-end graphics stations and NL video editors. Lower end systems would be targeted at gamers and musicians.
And yes, I would definitely see a full line of Commodore x86 machines for Joe user. Remember they did have x86 based business machines.
Mostly I think Commodore would be where Apple is today, perhaps even more so. Perhaps they would have swallowed up Apple by now.
I don't think Amigas would ever have pushed out x86 PCs as the most popular platform tho. x86 got where it is today by being cheap and relatively open as far as hardware. Anyone can manufacture and sell PCs and parts. That's always been the edge.
In short, Commodore would be a combination of Sony and Apple.