Not this season. There are too many glaring weaknesses I see and without an immediate roster change I don't think they have the time to address them.
The roster needs to be slightly revamped. They need to bring in a defensive PG or SF, preferably both though I think Ariza can fill the SF spot by next season. They also could use a veteran or two on the bench to bring consistency and leadership. Most importantly they need a serious commitment to defense. Someone from outside Phil's circle needs to be brought in.
Until they make these changes they will be pretenders. This team will probably win the WC, but the real contenders are in the EC and they are playing fantastic ball right now.