I think an irony in the whole butchering of Parker's minutes last night is that actually proved his intrinsic value to the club -- or, more specifically, it demonstrated that the notion that George Hill can just run this team and nothing will change is a bit far-fetched.
What killed the Spurs at the end of that game was execution (or the lack thereof) on both ends. The two vapor locks on Webster were absolutely inexcusable. I'm not sure that Parker necessarily changes either of those plays. But the Spurs had the chance to overcome those mistakes by staying poised on the offensive end, getting into their sets, and finding offense when they needed it. Presumably, the criticism of Pop in not getting Parker back into the game during that long whistle-less stretch includes an acknowledgment that things would have been better with Parker on the floor. I absolutely agree with that, but I think the truth of that is more about how the Spurs run offense with Parker. For several days, we've read here that the Spurs should deal Parker, hand the reins over to Hill, rely on Manu and Mason as alternate initiators, and all would be fine. But without Parker in the game in those crucial moments, the Spurs seemed flustered on the offensive end and didn't seem to have a clue about what to do to find scores. Tony Parker might not be an ideal point guard, but there's a reason that he's among the best at that position in this game right now and that is related to how he runs his team in crucial moments.