SSD will be the future for portable devices (I'd say becoming standard before the decade is over), but its unlikely that they will ever become mainstream in desktops. There is simply no real advantage to be had.
Michael: Jodie, how's my schedule look for today? Jodie: You've got a conference and dinner party at the Japanese Embassy regarding wildlife protection. Michael: Oh, yeah...sorry, but I'll have to cancel that. I'm heading out to save America!