There aren't enough users on STEEM right now to keep all of these apps and projects active as we have seen with many that have faded out of existence. What we will have to see going forward is the likes of sportstalk and travelfeed onboarding their own community and building from there. It's obviously great to have STEEM as a base to get projects started and people interested in these subjects but we will need to see some of these projects stand on their own two feet if they are to suceed.
The way that tribes are being set up makes me think that if we can create a couple of successful ones that it will form the blueprint for new groups to start their own tribe and see how it can be done. It will just take a while to get the process simplified and tightened up but I like the vision behind it.
Be a travelfeed users foremost and discover the rest of STEEM through it rather than the other way around.