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GW2 will suffer the same fate as other forced grouping MMOs. Remember Vanguard? A heavy group forced game? Once the population either leaves or reaches endgame...a newbie can't do ANY quest (barely), because either the game is not populated enough or/and reaches high levels. And it isn't only Vanguard. Every forced grouping game suffers the same fate. Ryzom does as well, the only thing you can do is be powerleveled by higher skilled players...no fun at all
The dynamic events are really going to suffer when everyone leaves the starter/lower level zones. Newbies won't be able to do any event, because there won't be enough people. This may not hapen right away, but a year down the line? You bet it will. Dynamic events are really group focused, and with no one in the lower zones...it just won't work. Now, the level scaling...high levels may come down...but I did this and still roflstomped everything. I had more fun in the higher level zones, personally...a lot more challenging.
Can't have forced grouping work forever, especially when the population drops or/and moves on. This is why GW2 will ultimately fail.