I watched probably 75 games last year. My opinion is this:
The Spurs didn't always look like they were tanking to most people. The reason is because they tanked defensively harder than any team in history. They intentionally left three point shooters open in the corners. It is exactly the opposite of the offensive strategy Pop pioneered with Bruce Bowen. In addition, they always left bigs going to the front of the rim for putbacks or easy finishes. This took a while to figure out, as the Spurs accidentally started off strong the first three or four weeks of the season. Some nights they could blow teams out on accident just from hot shooting. The giveaway is how often Pop didn't go Serbian on guys for messing up rotations or giving up threes.
I feel like, with the combination of shoring up the defense, not resting players and holding them out for piddly minor injuries, young player development, and of course Wemby, the Spurs can exceed Uriel's prediction. No telling how many waves they can make if everything goes right.