Apparently it isn't a neighborhood play if you don't throw to first. But that is all the more reason to make a rule protecting fielders at 2nd base. Tackling them has 2 advantages:
1. Prevent the out at first
2. Possibly prevent the out at second if you can stop them from throwing the ball
In other words, instant replay increased the advantage for tackling fielders at 2nd base, as well as making fielders try harder to touch the base (since they may not be able to take advantage of the neighborhood play). So to everyone saying "why now", it is genuinely more dangerous these days.
But again, he wasn't safe either. At the time the umpire made the call Utley was tangled up with Tejada, and Tejada was still holding the ball and could have tagged Utley if he had been called safe.
So we end up with a weird situation in which if Utley was called safe, he would have been out. But since he was called out, he became safe. Replay shouldn't work that way, this was a time to go with the call on the field because there is no possible way to know that Utley could have gotten past Tejada to get back to 2nd base. If he had touched 2nd base during the slide, different story, but he didn't.