Well... the problem with any solution is that it will take time to implement. Going along these lines, maybe we should just lay down and die, because living takes time?
Srsly, the amount we've spent on the Iraq war should be enough to replace all of our coal fired electricity production. And of course, technology that improves emissions will take time to implement as well. Does that mean we shouldn't do it? Well, we can either do it, or advocate it, or continue to do what we're doing now. The point being that we might as well support what we feel will help us, because the alternative, not supporting it, definitely won't help us. We can also do whatever we'd like to do on a personal/immediate level, so it's not like they're mutually exclusive. Or for that matter, w/o quantifying the impact of biking versus driving versus some low impact combination of the two, stating anything will have any difference unless it's established is purely speculative.