A few high-profile games are using the micro-transactions model, but still, the overwhelming majority of games today are using a traditional "pay for it up front" model. Assuming that this isn't going to be some sort of a freeware "Open Tournament" game that no one has to pay anything for, I don't see why they wouldn't continue forward with the traditional "pay up front" model.
However, I do agree that the possibility of a micro-transactions model is a concern.
I'm very malevolent about UT3, but I don't hate Epic for it. I think they just fell under the spell of consolitus, got into bed with a loser (bankrupt Midway), and lost their way.
UT 2004 certainly has many rabid fans who never played the original and who think UT 2004 is the shiznits. What they fail to realize is that the game types they enjoy are Onslaught and Invasion-RPG; that's what people are playing in UT 2004 today. In contrast, they don't play the "on foot" games much such as CTF which was the #1 game in UT99.
As I see it, UT 2004 was a great game for Onslaught and Invasion, but UT99 had better movement (non-floaty-dodgey) and feel than UT 2004 and was thus much better for on-foot games (CTF, DOMination, Deathmatch).