I take it this is a 5 X 5 league? And you already stated it wasn't a keeper league right? Then i'd go ahead and do the trade.
Conine is the 10st best third baseman and should continue to be productive, i thought you could of been stuck with Vinny Castilla or Jeff Cirillo or possible worse but Conine is sufficient. Plus you then get Escobar.
Although i do think you are being a little to hard on Cameron the guy will hit his usual .260 and will probably go 30-30, last year i think Vlady & Magglio were the only ones to do this. You can probably add a few more this year in Soriano & Preston but it is rare. Even with his .230 BA right now he is still a more valuable OF than J.D.. Plus Cameron is in a potent lineup in Seattle while Drew will ride the pine every so ofton has Larussa likes to play the #'s game he will start K. Robinson or E. Marrero and bench his studs like Drew, Edmonds, Pujols. Plus, J.D. is in a funk he is not getting his usual RBI's and rumor has it he is trying to pull the ball all the time.
Even still i think the deal is a good one considering your backup is Conine and your pitching situation. Go for it. I just wanted to clarify things alittle with Cameron.