I get it, that many players were bored with Ezzio after Brotherhood and disliked Revelations, but they are not the true AC fans...
I loved Revelations, because of the new enviroment and the MOOD of the game(music/sound effects & visuals)... ...with Revelations, we got Ezzio back, but we also got ourselves a new, different part of history.
...though I think it won't be nice to make trilogies of all protagonists... ...INSTEAD, ONE GAME COULD BE LONGER (EVEN WAY LONGER, THAN AC 2 OR 3)...
...two games/protagonist is fine...
I've red the announcement somewhere, that Ubisoft is considering a 2nd game for Connor & I approve the idea...
...after that, we could get a new modern day protagonist & an ancestor, that has lived in the 13th century & met Altair...
I think, the best locations for future AC games are: Egypt(in several time-periods), China(16th century/protagonist could be close to Yuun from AC Ambers), 1st and 2nd world war(one protagonist in the 1st and his sun in the 2nd), Ancient Greek, The times of Jesus(the historical Jesus, not the biblical/though, that might would be risky to make, because religious fans could reject AC after that), 1st civilization times(Adam, Eve, or someone close to them as protagonist/that could turn out as a trilogy, or even four games), modern dayes(no ancestor)...