As the old saying goes, "Defense wins championships." After watching Houston fail to play good defense for several years, I'm ecstatic that we have two centers who are excellent defenders, and that they can play together for short stretches. I fully acknowledge that against some teams, especially with stretch fours that can spread the Rockets out, we may lose some regular season games if Houston doesn't adjust. But we have the personnel to go small when needed. Our roster is currently set up to be able to neutralize the opposition's strengths and attack their weaknesses.
If Houston ends up playing Memphis or Indiana in the playoffs, McHale can trot out two incredible low-post defenders, and force their perimeter players to out shoot Harden, Parsons, Garcia, Casspi, Lin, and Beverley. Negating their low-post strength gives the Rockets an advantage. Having Omer as an option gives Houston that chance to match up with any big team. The other 36 minutes of the game, in which it's either Howard or Asik and Jones, Motiejunas, Casspi, Parsons, or whoever, gives us a full season of preparing the team for healthy doses of small ball, which will also be needed at times.
My thought is that if the Howard-Asik tandem can function for 10-15 minutes per game without us falling behind, the positives will far outweigh potential negatives.