I have a feeling that you’ll be able to watch it online as often as you want for at least the next 50 years.
I just typed “r” into the Google search box and the first several results were “royal wedding.” There is a large number of YouTube selections already with this tag. So I’d say—seek and ye shall find.
Nods at Jeruba. I think we will be hard pressed to avoid the royal wedding and its participants for quite a while to come. We have the “where is the honeymoon” thing to come, the “what did she wear on her honeymoon”, the “when will the baby arrive” stories. Oh dear.