I would like to believe they could work.
But.. I really can't tell you whether they can work or not. I don't know.
An online relationship can not work out forever. That I know. Only a few years, and it'll break or it could do with moving to an offline close relationship.
But I don't see why they can't work for so long. There's no reason they won't. Nothing to stop them. The internet is very limiting, it's true. But there are ways around, to show your feelings fully. Oh I don't know... Maybe it shouldn't even matter to me anymore. It does, though. I just try not to let it.