I don't think a bridge is the worst option, I prefer it over the deep tunnel. The worst option is surface up centre though. Ideally they'd end the bridge in such a way that it could go underground into the bluff at that point, or elevated after, so there is a choice when funds are available.
I get what Frinkprof was saying about needing to get that bridge down now so the entire option doesn't disappear in the future. That's a good point. But I don't think it excludes the option of using it for buses in the short term.
An elevated section like this:
https://goo.gl/maps/4HQyY5HdQ1HqyXSo7
up centre to 20th ave or so would be the best cost/non-obstructive balance, I think.