Hypothetical question with multiple assumptions:
"What MMOs do you think you'll be playing for most parts in 2012".
Assumption 1: All major MMO titles are released according to current speculation. (SWTOR in Q4 2011, GW2 in Q1 2012, TERA Q4 2011 etc.)
Assumption 2: All these titles live up to their promised features and are as good as to be reasonably expected.