It would be a great alternative and it does not need to be BTC. It would be great if the teams would pay hunters with stable coins or with the most popular crypto currencies to avoid the coin dumps.
You are talking for the devs whereas OP is concerning about avoiding disappointment after participating in to bounty programs. I mean dumping after the distribution of reward is not a problem here but lots of bounty programs have scammed the participants and we need proper action for that so that we can save this forum as well as altcoin industry. I too guess we must enforce all the bounty programs to be in BTC or in ETH.