To be honest, working on bounties is no longer worth it cos of HUGE amount of scam projects and projects that eventually are closed cos of current market situation that takes place for months!
The next big goal to achieve the success in crypto is to transform the enthusiasm in bounty hunting into the enthusiasm in utilizing crypto by means that it should be used. Basically bounty hunting is good for a project but what might happen when bounty hunters becomes a trader is much more beneficial for the cryptocurrency space. Mostly, bounty hunters job is to earn and sell ahead, they can hodl a bit then focus more on trading since as you said so, bounty isn't that worthy at this time.
How to know people losing interested with bitcoin and altcoin, they look enjoy investing with bitcoin as investment for the future. Just today bitcoin back to lower price and drop to $7,5k. Very cheap price last than six months of bitcoin today, will be moment for bitcoin reached to higher price above $20k or bitcoin want to back under $2k, nice for waiting what will happen with bitcoin at least this year.
I think that a good indicator today is a clear decrease in the capitalization of the entire cryptocurrency market. Of course, you might think that many cryptocurrency users sell cryptocurrency and withdraw their funds to Fiat, but to some extent, speculators who, thanks to manipulations in the cryptocurrency market, earn cryptocurrency and convert it to dollars, thereby not caring for the future and reducing the capitalization of the cryptocurrency market . But nevertheless, if we compare the indicators of the highest-rated cryptocurrencies, Bitcoin and Ethereum at the end of 2018, with the indicators for today, then I am sure that these indicators say very differently, that a fairly large number of people are still interested in cryptocurrency.