Yes, but I think the only way to get people to use it is if they don't have to create yet another account just to reserve a table. Let people put in their phone numbers and text to confirm.

You'd also probably want to partner with Yelp if they're not already working on something similar. I'm guessing that OpenTable is so popular with restaurants because customers use it to find open tables at a particular time, so the network effects matter. Yelp gives you a leg up there.