to answer your question OP, from an objective perspective i would disagree, however there is a grain of truth in that statement, yes we the older players have changed, but so has the game and social landscape it is played under, so both parties have changed and for most, in opposite directions, hence why the arguement exists in the first place, the social landscape has shifted so much from the one seen back in the mid 00's, where most people played 'slower' and were more often than not more willing to offer help or do things 'for fun' regardless of what level of the game they played at, in the landscape of today that's not the case and it clashes with older players memories of yesteryear and what 'used to be' which for many 'should still be' and that's why i disagree with the sentiment.
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without any data to confirm nor deny this statement you can't say either way, while i agree it's not a nice thing to say, there may well have been someone who offed themselves as a result of the downturn the game took over the course of Cata/MoP and were so deeply integrated into the game from a psychological point of view they couldn't take it anymore and felt that the final straw was blizzard going quiet 'confirming' the game was 'dying' in their eyes, it's a Schrödinger's cat situation.