I feel like the most interesting part about his answer there was that he prefers to play healer in casual content with random people, because he feels like as healer he has the most control over to make sure there will be a smooth run of the content. So I don't think it is that strange that someone doesn't support the strike if they play healer in casual content because that is the role they enjoy the most there (even with the state the game is in).
The just a few people argument sound a little bit dismissive for sure though, but if I understood it correctly it sounded like that it came from experience where he supported stuff like this in the past but later found out that he was only part of a minority where he thought it was a majority before. So I can't fault him for feeling like that.
About waiting for the content first to release. I can understand everyone who is fed up and doesn't want to wait but I can totally understand as well if someone wants to wait and see first. Because it is not long until the expansion releases and nothing will change until then anyway no matter what.
I think his answers there where pretty decent and reasonable (even if they could have been worded a little bit less dismissive in some regards)