Here in Chicago, my cat's veterinarian has a Play it Again used sports shop with tons of bikes next to it. There was a line of people outside the shop when I dropped them off, and a line when I came back to pick them up hours later.
Even if this sudden swell of people suddenly running errands and commuting by bike dies down in the next year or so, we'll "capture" a good chunk of people who find that they love riding and will continue. I hope that translates into more bike lanes, more advocacy, more safety, etc. in our city going forward.