The tribes open up new opportunities for rewards, especially at a time when Steem is so low.
But on the other hand it also creates a lot of spam and shit content when some are pushing out multiple content each day just for the upvote. Hopefully mods from those tribes will keep a strong grip on the content otherwise their token may end up just like the content.
Yep, and yep.
How the tribe is moderated will be a key factor in it's success or otherwise. The new rewards and the lack of influence from the 'old' cleaning accounts has given the abusers new opportunity.