Change is constant. It may be rough sometimes, and it may be smooth other times, but the only constant is change.
I understand that sometimes when things change, it may effect my game style, power, or playing for some time, and it may make me have to change my tactics so to speak, but thats all part of a game. You will have this no matter what game arena you enter. Think about EQ (as painful as it is to do so) in the respect that, when it first came out, rogues and rangers were useless and noone wanted to play one. After so long now, rogues especially, are insane damage dealers, and everyone screams nerf.
Point being, blasters were the FOTM, scrappers are as well, controllers after they get pets at 32, fire tankers, the list goes on. Constant tweaking is the only way to find the correct path to any sort of balance, and sometimes just putting something on the test server for a while doesn't cut it, because until it is released as content for the whole with everyone running through every possible variable, it can never be completely tested. Heck, there may be things out there that we still have not discovered.
I will continue to play, and if it gets rough as I level, which I am sure it will, I will still play. If a AV chain stuns/holds/sleeps me, I will find a new path to defeat him/her/it. That is the fun in gaming for me, bring me a challenge and I will defeat it, regardless of how impossible it may seem, and I hope this holds true for the rest of the heroes out there.