People make some common mistakes when it comes to tribes. In the early stages of the game some tribes seems to be very strong and cool. But after a month or two those tribes fall or simply fail.
Not working:
- family tribes (they don't usually work because lack of communication, personal interests etc.).
- continental tribes (at some point they are cool... but people start to fight over villages and so on... too much blue around you).
- blind recruitment - you will only find noobs.
- huge allies list - you need farms don't you.
World 6 is a little crappy in the begging. Too many tribes... point whoring etc.
I think the dominant tribes will be: Ori, RoE (if it is the same team from W5)... I don't know time will eventually tell.