The taking Tokens and boosters with you thing could make or break the idea really. I still don't like the idea of abandoning your normal team and starting again in a higher level (I've nothing against an option where you can re start the game, but I don't think people should be able to jump into "level 8" with a new team that they haven't put work into). It could turn into a situation where you are playing against your old team if the leagues build that way.
I've a little over 3000 Tokens at the moment due to farming. It would be criminal in my opinion to lose those by taking a lower level team - even more so to those that actually buy Tokens and invest real money into the game. All I have invested in this game to date is time - and I feel pleased and happy with my team that has been built as a result of my hard work. To think that someone could pick my team up if I didn't log in for 70 days etc... and benefit from all my time and effort just seems wrong. For those that have put money into the game I think its more insulting to them too that they could see all their money go towards giving someone else a heads start.