While this is true, we also can say with a fair amount of certainty that Dallas and San Antonio will meet in the second round. We know the winner of the SW is going to be the number 1 seed, and we know that 2nd place in the SW is probably good for the 4 seed, and Memphis sure as isn't going to overtake either Dallas or SA.
Likewise, we know that Detroit is probably playing Cleveland in the second round based on the same logic. While I hate to agree with Dark Reign, a second round matchup against a Dallas team with playoff experience coached by my man AJ sounds scarier than a series against LBJ, and injury-prone Larry Hughes, a big white dump down low, and a bunch of scrubs. Dallas has kept up with the Spurs all season, while Cleveland is 11.5 games behind Detroit.
As for the other conference semis, unless something completely crazy happens, you have Miami/NJ in the East and Phoenix/Denver in the West. The winner of those two series is pretty easy to call, but by no means a complete certainty. So what seems likely is a Pistons/Heat, Spurs/Suns double rematch in the conference finals. That's what it looks like right now, and there's definitely a higher probability of that scenario than something crazy like Nets-Nuggets in the Finals. Obviously anything can happen, including injuries, upsets, or Armageddon, but looking at it realistically, it looks as if Detroit will probably have a much easier semi-final matchup than the Spurs, and thus an easier road to the Finals.