I know that these accounts perform functions intrinsic to the operation of the blockchain, but if the choice was to sell some of those tokens or lose the blockchain, it makes no sense not to sell some. That level of funding can easily pay for what is needed for a significant time period.
I've commented on this elsewhere. Instead of dumping the tokens on the market and putting selling pressure on Steem, this should be done off market, with strategic investors or partners and after careful negotiations, in which not the price or the stake sold should be the main concern, but what is obtained during the negotiations. The new stake owner, terms and price should then be announced publicly. That of course would have been better to do when the situation wasn't as it is now.
Otherwise I completely agree with Indigo, we need more fiat into Steem, to grow its market cap, and not just play around with the little we have, because that only feeds the downward spiral.