The Heat still need to begin to be dominant. They just were lucky with all injuries (Rose, Howard, Bradley,Pierce,Ray...). Of course Bosh couldn't play for some games, but no team has the refs on their side (except for the Fakers) like them. So that equals things.
OKC and Miami may win a title or maybe more, but remember this is Stern-ESPN-NBA, where the machine needs a newer, cooler story almost every year. If/when the Heat win their ring, their story will be old, just like Wade, who looks older than KG right now. OKC seem to be well built, but their inside game is not that good. They have humongous talent in the perimeter, but eventually a more complete team will be assembled and their jumpshots will stop falling in.
Chicago still scares me more than those teams, but next year Rose will be rehabbing, so there's a chance for yet another last run of the Big 3. We need a beast who can crash the boards and protect the rim, and bring back all the rotation players. Stiemsma will be great as 5th-6th big from the bench, so we need some help there. Wilcox, Green, Bass and Bradley plus the Big 4 and some young players will be enough to compete with Miami, who is at the top of what they can be right now.
Go Celtics!