I think the average consumer is a lot less aware of a locked down bootloader, the advantages between stock vs touchwiz, or any of that. They might notice that Bing search is included on the Fascinate, or that Sprint NFL is included on the Epic, but I don't think they're going to lose any sleep over something like that.
The average consumer wants a phone that's attractive, easy to use, and has the apps/capabilities they're interested in. The things us ATOTers look for are either unknown or an afterthought to them.
If Google doesn't want a phone like the Fascinate to ship, they have a very easy way to stop it dead...deny it access to the Android Market. They've done it before, and I'm sure they'll do it again. Its their method of controlling the system while leaving Android "open".