I really liked the ending. Like the other Journey song on the jukebox said: “Any Way You Want It”. Personally, I think he was whacked.

6/12/07 Update:
From this exclusive interview with David Chase:

One detail about the final scene that he’ll discuss, however tentatively: the selection of Journey’s "Don’t Stop Believin’" as the song on the
jukebox.

"It didn’t take much time at all to pick it, but there was a lot of conversation after the fact. I did something I’d never done before: in the location van, with the crew, I was saying, ‘What do you think?’ When I said, ‘Don’t Stop Believin’,’ people went, ‘What? Oh my god!’ I said, ‘I know, I know, just give a listen,’ and little by little, people started coming around."