Are bounty managers still in high demand?
Yes they are, there are so many projects that are waiting to be promoted and they may need someone to manage the campaigns. Just look at bounty thread and there are lot of campaigns in here from the same bounty managers, maybe there will be a new campaign for more diversity.
Is it difficult to become a bounty manager now and is it worth it to try to become one?
Being bounty managers are not just simply checking the participants to be eligible for the reward and stuff, but you need to know about the project you are managing on. You don't want to get flagged by default trust members just because you are promoting scam projects without having some knowledge before, it's always worth it to become one but make sure don't be an ignorant about the project.