I can understand why Bosh would be upset. He's too good to be a spot-up shooter, and he wasn't really all that good at it in the first place. Essentially, his entire worth to the offense was his ability to do something that really wasn't his strong suit while Lebron and Wade took his spots on offense. Wade never had to make a similar sacrifice; he just needed to learn to not dominate the ball.
I think the Heat will be a pretty strong team next year, but that's under the assumption that Spo is worth is salt as a coach, which is still undecided. I think Miami as the talent to grab a top-four seed, though their PG situation is weak as . They need to figure out a way to trade for one of the B-list PGs who's still on a rookie deal like Walker or Knight.