the lack of volume pushing us here is disturbing.
These days it is much more difficult to estimate volume. More exchanges, some have free trading, much more opportunities to trade extra-exchange etc. I am not worried about that, it is a different game now.
But - It is true that exchanges are now very vulnerable to engineered crashes.
BTC10k market order would take Gox down by $100 (20%). If topping the April rally took a million bitcoins as some claim, now
BTC100,000 is handsomely enough. Exchanges still gauge the price despite their low share of the total volume.
Conclusion is that you should never sell to sinking or low prices. Only sell high, if ever. That keeps the manipulators in check, because they cannot be sure to be able to buy back cheaper. Also you have no chance to ever lose.
Any longer term (6-12 months or longer) it matters absolutely nothing at all what kind of boom or crash there is in between. Bitcoin's viability as a technology is not dependent on that.