My own view is that eventually all Premier League games will be televised in the UK and moved to timeslots other than Saturday 3pm. Its the logical long term outcome of the need for UK broadcasters to protect themselves against the foreign satellite players, not to mention the Premier League's desire for more money (which is a legitimate desire for a business to have, incidentally).
I disagree. When they announced in the auction for 2004-07 that they were going to have 138 live games, in the press conference Richard Scudamore said this was actually rather more live games than they would like to have on UK TV, but they increased their offering to avoid being seen as anti-competitive. Scudamore is still in charge and I don't think that view has changed.
Similarly there was an interview with Barney Francis of Sky in Broadcast a few months ago who said there's a danger of overkill and they didn't want to saturate the schedules with too much of any one sport because viewers would get bored and the big events wouldn't stand out. I certainly don't think there's a huge demand in the UK for more live games. The number of people not subscribing to Sky and BT because they don't show every match is microscopic, only massive hardcore fans would want it and they're already subscribing anyway. All you'd do is bring down the audience for each match at additional cost.
For Sky there's a further issue of cannibalising Soccer Saturday, one of their flagship shows. And I doubt the rest of football would be happy to see no Premier League games on Saturday at 3pm. The argument is that it would mean the Football League wouldn't be overshadowed but that benefits now from being at the same time, so people tuning in to Final Score and Soccer Saturday for Premier League news and results get Football League news and results as well. If there was no Premier League, they wouldn't tune in at all.
Take a look at next weekend's Super Sunday on Sky Sports where they've got to hype up Villa vs Stoke as the main attraction. You'd have loads more of that if they showed all the matches and viewers would switch off.