lol age
Anyways, I don't think its very uncommon for a team to undergo some major roster and style changes, and have a high level of success the following season, at least not as impossible as you suggest. Look at the Mavs from 03-04 to 04-05. Look at the Suns of the same years. Both teams underwent a lot of changes, and had a lot of success immediately. Suns went to the WCF, and the Mavs were very close to actually beating the Suns and going to the WCF. The Lakers in 07-08 had a major roster change in the middle of the season when they got Gasol, and went from being 1st round fodder, to being in the Finals. Technically, you could even put the 2010 Heat in that discussion too.
It's one thing to feel that way about a team with a ton of extremely young, immature NBA players. But this is a team that has gained a number of young but developed, proven NBA players who all still strive to reach a high level of team success, who are complimenting several veteran players who have experience plenty of success. So what makes it so incredibly impossible for such a team to win a couple playoff series, especially if they get favorable match-ups?