Out of curiosity, what makes you want to see bitcoins be successful so much? A backend programmer I'm working with wants to include bitcoin payments in a site but I'm not convinced.
why wouldn't you accept payment for soemthing? Taking payments in BTC is very easy there are a multitude of copy and paste code snippets that will do it for you. Unlike taking paypal or visa there are no hoops to jump through.
I guess my real question is how many people actually use it. I know for a lot of people it has a tendency to sound a bit scamy when you first hear about it. I feel like for those people it might be a turn off. Feel free to prove me wrong though.
plenty, have a look at bitmit.net, an ebay clone that uses bitcoins for payment, then look at bitpay - a bitcoin payment processor, they provide services to 2500 companies, reddit just adopted it so that will increase the nuber of users, it is still in early adopter stage but that is still a large volume of users.