The real "answer" to the bike bridge isn't going to come now (we'll have to see how it "bikes in real life") and it isn't going to come from GLX (it was a freebie/afterthought here) but real bike routes are coming when McGrath Highway gets boulevardized (for
Grounding The McGrath thread)
Either it will:
1) Be sparsely used due to hard grades
2) Be used in a self-limiting way (always a bypass for adventurous cyclists and a few picture takers)
3) Get widened in sections (and "overlook" at the top)
4) Be so heavily used that when the concrete decking is due for replacement, they'll swap in new wider sections on the same steel supports.
But really, I think the real answer is: be just another link in the network, where the network is the valuable thing, not any one link.