I disagree.
I'm a mostly solo player, as there is a dearth of good people to group with.
I've played a fire/axe tanker to 30, and while I can still solo, it's incredibly slow. But I will persist.
I think that other options should be exercised to control the rampant power leveling, but I don't think that just slamming AoE blasters with a nerf bat will accomplish anything other than pissing a lot of people off.
I won't leave if they nerf my (not even created yet) fire/dev blaster. I'll just figure out some other way to enjoy the game.
There are lots and lots of ATs and builds out there. And, frankly, it's just so exhausting to hear people always complaining "Nerf blasters" or "nerf Necros" or "buff Rangers". You get the picture.
Play what you like to play and what suits your style. If you want to munchkin, you will always be in danger of a nerf.
There is no such thing as lasting game balance in an ever changing world. When a game reaches a state of balance, it is usually a signal of impending doom.