I'm on 2.2 leaked, non-rooted and not concerned at this point... I'm pretty hopeful in believing that someone will have the "official" 2.2 and will have instructions for us leakers to "upgrade" our phones back to Stock 2.2.
Worst case scenario, I wait until 2.2 official is realeased, go back to stock 2.1, then do the OTA.
I guess my biggest issue would be having to wipe the handheld, though I have all my programs/settings documented so it would just be annoying to have to rebuild the widgets and setup the accounts again.
It's times like this when I really wish that Android had some sort of a Desktop Manager like my Blackberry did. The sweet thing in that software was that you could hit the "Change Device" button, hook your old phone up, back it up, then hook the new phone up and it would restore EVERYTHING to the new phone, right down to the notification settings and themes.
Anyone aware of a program that does that for Droid phones?