Re: Downgrade WordPress MU to a standard WordPress?
The merge is done in trunk. Seriously, the work has been done already. People have announced this merge since last May-ish. We’re just about at feature freeze, so from here on out will be bug fixes only (plus some UI work on the MU menus).
While I think it;s quite possible to downgrade MU to single WP, the reverse isn’t true and it would be much better to wait until 3.0. You’ll upgrade as usual, and there will be instructions on how to turn off the network and go back to a single blog. (probably cuz I’ll write them… )