Oh and Lucas never said he got out.
I believe the quote is that when making RotJ George Lucas considered Boba Fett to just be another one of the bounty hunters, a generic bad guy, and didn't realise at the time just how popular he was going to get. He considered putting Fett escaping into one of the special editions but figured it didn't really contribute to the story of the film.
Considering George Lucas told the developers of 1313 to make the bounty hunter in that Boba Fett, I'm guessing he quite likes the character and I doubt he'd rule that Fett dies in that hole.
Besides, he goes down there in full armour with all his weapons. That plant monster doesn't stand a chance.