You cant expect a stable income when you're only working as a freelancer online because the contracts can expire and in terms of bounty there are lots of scams, this can make earning more unstable. There are bounties that pay in stable coins right now but this is not the point and even if they promise to pay in stable coins or on any good crypto, they can still refuse to pay at the end of the campaign. After the ico, we have seen defi's.
Bnb, busd, and other stable coins are then introduced. This makes bounty more exciting because once you get the coin, you can sell them immediately. I don't know what change you mean, to replace them with a new trend? why, because you didn't like them?
Interested for joining bounty campaign payment with altcoin not using stable coin like BUSD because altcoin payment have potential earn higher return or reward than using BUSD as stable coin, but keep early for selling and depending distribution time. Usually if distribution early before coin listing on market is very worth because have chance to sell on higher price when coins have been listing on market, but after listing on market and delay distribution many of coin will be scam and have lower price for distributing to bounty participants.