I wouldn't worry- there will always be groups who want emps and who appreciate the time people put into good healing and buffs. Threads like this one used to pop up now and then on the live forums too, but it's very telling that healing powers were never massively altered or removed from the game. ;) People enjoy it, and the majority of players don't have an issue with it.
Give it a while, and we'll also get threads about bad tanks, arguments about MM pets, people complaining about side-swapping, and pretty much everything else. Because sometimes people get frustrated and need to vent after a bad experience, and sometimes people just don't like letting others play the game in ways that differ to what they would do. (Case in point- that massive thread about 'kill stealing.')
As a healer, it's not the tanks that are bad, it's the blasters who think they are tanks, split from the team, and think they are going to wipe every group with one shot. I just let them die now. Tired of running all over the mission to save the people who can't stick with the team.