That's a good point -- I'm not much a Petty fan, so I didn't notice the bastardization, I guess, but it seemed he only played four or five songs so he didn't have to completely cut them down too, too much. Looking it up real quick, Tom Petty only played American Girl, I Won't Back Down, Free Falling, and Running Down a Dream. That's how the Boss should do it... four songs.
The River is great, but the beauty of that song is in the story it tells, so I'd hate any attempt to cut it down. I'd gladly take Born in the USA (4:39), Dancing in the Dark (3:59), The Rising (4:50), Born to Run (4:30) -- the song lengths are obviously album versions, but they can be extended to cover the extra time. Unless he decides to squeeze in another.
I'd almost guarentee Born in the USA, The Rising, and Born to Run. Since the Rising's about an NYC Firefighter during 9/11 (in addition to being a catchy song), seems like something that one could expect him to play.
I don't know, though. If you ever listen to E Street Radio on Sirius/XM, you see that he's not above bastardizing some of his songs when he plays them lives.