As long as they don't reference his origin in AOTC, and they have a good script, who cares if Boba is a clone or not?
This has as much of a reason to be as a Sulu film in the Trek universe.
Yeah, not an A-list character at all.
The Boba Fett movie may or may not turn out to suck, but it is WAY too early to condemn it right now. I think Boba Fett has all kinds of potential to be an A-lister, and not just carry one movie, but sequels. There is all kinds of story potential, from jedi hunter to occasionally being hired as a mercenary for the early rebels, and any dirty bounty hunter job in between for just about anyone. The thing I fear most is "kid friendly up" Boba Fett and making said film too childish. As long as there's a decent script, that is about the only way to ruin Fett for me.
I just realized-- they can do this, then give us a Good Guy Boba Fett... Then at the end somebody else (or the original Boba that survived) does the same thing to him and we go back to bad guy boba fett for The OT!
Well, they sort of did this for the Bounty Hunter video game with Jango Fett. But just because a character is a protag in a movie, doesn't make that character necessarily a "good guy." I think if Boba Fett is portrayed more like Hondo or Cad Bane was in TCW, that would be sufficient. Those guys are definitely BAD guys, yet depending on the situation, you root for them. This is how Boba Fett should be portrayed.