Well, I'm not usually a NIMBY, but I would not support a bridge to the islands because it would deposit throngs of people in exactly the spot that shouldn't be overrun with people: the eastern, Ward's island side (the airport end being impractical for obvious reasons).
Ward's island is my favourite part of the island - maybe my favourite part of Toronto. It's this idyllic collection of cottages on a completely car-free, pedestrian-oriented series of lanes with immaculate gardens and a nearby beach. I would hate for that to be ruined by thousands of people coming off a bridge, demanding concession stands, fast food restaurants, overflowing public toilets and all the other things that a massive influx of people require. It would single-handedly destroy Ward's island.