It's hard for me to believe that push technology is going to revolutionize the internet. Why? Because it didn't happen last time (or the time before that).

From http://en.wikipedia.org/wiki/PointCast_(dotcom):

    The PointCast Network used push technology, which
    was a hot concept at the time, and received enormous
    press coverage when it launched in beta form on
    February 13, 1996.

Since the early days of the web, people have recognized that the pull model has serious limitations. Unfortunately, pushing data to users has never been compelling enough to spark anything that qualifies as a revolution. People really want data to be pushed to them if that data is intended specifically for them (e.g. email and IM), but not if it's general weather and news data.

I do love Cuban's honesty, though:

    Would NY Times online readers pay $1 a month to be
    guaranteed that they get their news first, before
    anyone else? I dont know.

Most people would claim to be able to predict the future in order to make their point. He doesn't.

EDIT: I should add that his idea that "Huge databases can talk to huge databases and exchange data more efficiently" is cool and makes much more sense than pushing data to users. We're actually working on something along those lines right now...