I do not really think Openledger will be insolvent (at least I hope it is better secured than other exchanges hacked). Anyway it would be big problem for BitShares as you wrote. I just make a remark, that it is a out of the blockchain solution and other BitShares shareholder may have problem with it.
The market capitalization of BitShares is simply shame and I am sure it is all about the problems with voting for development. You know that there is oposition against any spending and it is (IMO)crippling advance.
Regarding the shorters it is misunderstanding. I wrote that the first plan before BitShares started was that the shorters will pay for borrowing bitUSD 5% and paying interest for the right to short and bear the risk would be to much. But it does not exist now.