It's really just waiting for the first trader to realize Bitcoins aren't worth anything at all actually, since no businesses accept them (and businesses don't accept them because there are no customers anyway). When that happens the price will probably nosedive.. It's quite important to get some substantial 'bitcoin consumer'-base before that happens.
Yes and for that we need to reduce the barrier on usability, but not by compromising key values.
An other possible route is to offer a service not available with other currencies consider the trust chain I have thrown in here:
http://forum.bitcoin.org/index.php?topic=25409.0