Timeline was rolled out to all accounts only as an option, I believe.
I'm still on the "old" profile, as are many (if not most) of my friends. Yet to see a hard push to switch over, though I'm sure it'll come any day now.
Are you sure? I still don't have it (thankfully). I'm probably on the tail end of their rollout though. Might help that I hardly ever use Facebook anymore.
I can't stand timeline. I find it really difficult to read them for some reason - probably something to do with having more than one column - and poor alignment - it's cognitively difficult.
Echoing the above, I don't have timeline yet either. Does it have something to do with the age of the account, I wonder? I've been on FB since sometime in 2006.
On a side note, I didn't do anything to keep the old display style, I just didn't manually switch myself to the new timeline, and they never auto adopted me over.