Well, every one of us could remove 100% of our BTS from all the exchanges, and see what happens. (And it could greatly increase voting as well and make the network more secure).
I agree that some proof that exchanges are not running on a fractional reserve would be very good. The weirdness and quantity of dumping on bter right before they went down was pretty suspicious, and I was extremely worried when they came back up but didnt allow withdrawals.
Almost all my BTS is now off of exchanges, only small trading positions left.