I agree with Matthew on everything he says. Here's another example: CDs and DVDs are far more common than cassette tapes nowadays, at least around me, but the components to play the cassettes is still available.

I don't think the switch will be overnight either. The only issue with the DVD recorders now is the format. Prices are coming down. I expect there will be models under $500 by next year. And so on with any product type you choose.