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Making the game more difficult won't be the end of blasters. It will just be the end of blasters farming hazard zones with alpha strikes/massive AOEs. You'll have to stick to small groups of minions/lts for advancement like alot of the other ATs need to do.
Look at the way the game is now. It's heavily favors those blasters who can insta-kill large packs of near even-con mobs. With the ability to do so, grouping is not necessary and even discouraged to some extent since xp rewards tend to go down in groups. This game was meant to be done in groups, while having the option to solo. Currently (well, pre-update. I haven't done much testing post-update), most can solo almost anything of value. Obviously, this warrants some change.
The front loaded AOE damage also makes alot of the support classes unimportant. You don't need a tank, controller, or defender if you have blasters who drop everything in a few secs. Sure, they may make it a bit easier, but realistically they aren't needed.
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Go take a look at high lvl illusion/fire cont, fire/inv tankers, spine scrappers, they solo much better than blasters, heck I've seen lvl 43 fire tankers taking on 46s without denting his HP lol...