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Based on the X-fire activity figures (which in such cases might not fully represent the subscribtion changes - as players might still be subscribed, during such release periods, to their previous MMOs, but they're just less active in it), here's a brief overview of the changes I noticed during the course of the last month.
Most affected seems to be the Aion - which dropped by about incredible 50% (from 20-25k hours down to 10-12k)
Another huge loss was recorded in WAR - that dropped also by about 40% (from 1300h down to about 800) and in LOTRO (from 13000-5000 down to little below 10,000)
Then comes the group of games mildly affected (within the range of 10-25% loss), to which belongs WoW (from about 200-250k down to 170k-190k), Age of Conan (1500-1600 down to about 1200), EVE (to my surprise has gone down from 10-11k to 7-8k), Global Agenda (from 1k down to 700-900), EQ2 (from also about 1k down to 700-900), DDO (2k down to 1500-1700)
Subsequently comes the group of games, which seems to be unaffacted for whatever reason - Champions Online (which even greatly improved due to its free launch), Fallen Earth (also mildly improved from about 150-220 to 200-250), Darkfall (still being around 150), Guild Wars (maintaing its 8k-10k figures), SW:Galaxies (balancing around 1k), STO (being within the range 1400-1700), Anarchy Online (with slight improvment similar to Fallen Earth from 150-220 to 200-250), Vanguard, DaoC, AC, EQ1 (all preserving the same low activity at around 50-100).
Given this activity figures, one can conclude that the majority of current RIFT players are previous Aion and WoW players (that might even represent 2/3 of the overall RIFT population). Probably no surprises there, what surprises me personally is the fact that EVE, which is a completely different genre, was also affected and that the Guild Wars seems to have no loss in its activity whatsoever. Note, that I am not a RIFT player and I do not plan to ever will be, I'm just taking an interest in these subscription and activity trends.