Nicko was on Eddie Trunk's show on monday and said the reason Hallowed isn't in the set is because the original set they had planned was going to be too brutal on Bruce's voice to sing night after night. So they did some rearranging and decided to take it out. He didn't say anything about Infinite Dreams but he did mention they went with ATSS so they could have a break in an otherwise upbeat set.
I guess what we can take from that is Infinite Dreams was probably one of the songs taken out to make sure Bruce wasn't killing his voice every night. It's too bad it won't get played, but at least we understand now why it didn't make the cut.
3/20 - Dream Theater