Northern Light
Superstar
I'd disagree with it. I'm of the earlier generation and I've always viewed Mississauga as a totally unwalkable suburban hell - except perhaps in the old Port Credit area.
I didn't agree with a comment that said every area is identical or has equal appeal as living or shopping area to everyone, I agreed with the idea that the region (Toronto) could generally be seen as one Metropolitan area, which it is, the Greater Goldenhorseshoe.
That said, I don't think two central GO stations benefits the city. Especially with neither connecting well to the LRT.
If one is seeking maximum commuters to Toronto, stations on the Lakeshore line are preferable, if one is seeking people to be in-bound to downtown Hamilton for work or play, then a station downtown makes more sense.
I don't really see, in the fullness of time, why both can have reasonably frequent services. (every 15M in peak, and every 30M off-peak). I just don't think a major investment to expand service in the downtown area of Hamilton is pending anytime soon.