How is it unrealistic? They've played roughly 28 and 18 mpg so that they could be as fresh as possible for the playoffs, in order to play significantly more minutes when they get there. 35 and 28 mpg is right around what I'm expecting from them. They'll be the odd blowout, though, where they don't play much. Also, keep in mind, the playoffs (particularly first round), the games are spread out. Not only are there no back-to-backs, but there's plenty of two and three day breaks. Within' reason, you can't worry about them wearing down. This is probably McDyess' last season and it might be Duncan's last legit chance at a championship. If it takes playing them more than what's ideal, so be it.
It's not ideal at this point, but there's still time to integrate Splitter. Speaking of the initial starting lineup masking the backup big deficiency (with Splitter not playing). What was overlooked in Blair's move to the bench was the positional change involved. He went from guarding four's to guarding five's. He already had his hands full with four's, but he's completely over matched against most five's.
No chance the Spurs can save McDyess for the WCF. It's looking like it's going to be the Grizzlies or the Hornets (I'm guessing Hornets), both of which McDyess would have to play a big part against. Especially against the Grizzlies. The Jazz aren't going to make the playoffs and even if they did, Okur is done for the season.