I think online Master League sounds more intriguing then 11 on 11. The latter I can see not turning out as the perfectly balanced game it should be. Not everyone is going to be disciplined enough to play their position and we'll end up with 11 strikers vs 11 strikers. Could get messy unless they introduce an incentivised system to make players stay disciplined.
The online Master League will probably have to rely on a centralised server hub. The first that will happen is players will rush into earning as many points as possible to buy the best players. Doubt we'd see players selling fairly tho. Again, could get messy.