They won't drop it any sooner.
Microsoft *should of * dropped the X360 price in March last year, right after Crackdown and the other 5 games that sold 1m in March-Apr last year, but they didn't. MS has waited to the last possible moment to make moves like that thus far....And I don't expect any different.
However, if MS did want to gain a bigger marketshare in Europe, they'd need a 75 Eur price drop, and try to gain a few big exclusives that Europeans care about (Racers, soccer games, ect).
Back from the dead, I'm afraid.