Perhaps, but if all you're going to do is move to Socket 775 then you've gone from a board with a (if slightly uncertain) future to a dead socket.
In a while I suspect socket 775 processors will be extremely expensive, because so many bought Core 2 Duo CPUs, and when they come to upgrade it won't be pretty. So if you want to upgrade the processor again in a couple of years time, you'll probably have to sell that new board as well. Might as well cut out the middle man, and just flog your AM2+ board in two years' time instead. It'll be much cheaper for you long-term.