Are you seriously expecting Ethereum not be spending the BTC 250,000 - someone has to pay for all the travel, hotels, lawyers, Merc, private jets, drinks and pizza....
spend the BTC and then ask for more later, if no one gives more BTC then apply the NO obligation to Complete the SOFTWARE clause.

Guys, I was not joking. Can someone please explain what's wrong with the approach I suggested?
Don't spend BTC. Buy ethers now, spend later.
IMHO, Ethereum team / devs holding 50% (May be, 49%) is not bad.