Many popular PC games are huge nowadays.  I mean literally over a gigabyte.  The million dollar question (literally) is how much is too big? What what point is the file size such a barrier to entry that it becomes economically unfeasible?

In the recent World of Warcraft beta, the download size was in excess of a gig and there are thousands and thousands of people happily participating in that.  I am a big believer that people (like me) want the convenience of pressing a button and having the game.  No CDs to mess with (or lose or damage), no wondering if it's out of stock.  But there has to be a limit on how big a download can be before most people, even those with cable modems, won't be willing to do it.

I wonder what that size is.