If the Rv250 is $150 US dollar card there is NO EXCUSE for the general DX7 userbase not to upgrade, its not expensive and its readily available.
No excuse, just like you have no excuse to take $150 out of your pocket right now and burn it..... go ahead...... burn it. The Ti200 is already available for less then that, why should the RV250 be seen as a major step up? Because certain effects can be pulled off in a simpler fashion if the developer codes it properly?
In order to play a game, you think people should jump at the oppurtunity to drop $200? For
one game? Will Doom3 play on DX7 level hardware? Yep. Will it look a lot better on DX8 hardware? Yep. Is the added visual difference for that one title worth and additional $150 over the $50 price of the game? Not very likely.
If you are completely obsessed with graphics, and don't care that much about games, then I could see how it could become a 'no brain' choice. That isn't the case with most people. I could pick up NeverWinterNights, Morrowind and JediKnightII or a RV250 to replace my DX7 board which gives nigh identical visuals and would allow a slight bump in resolution for the games I've already played through.....
Why spend money on new games when I can play Q3 running 1280x1024x32 4xAA instead of 1280x1024x32 2xAA?
Right now there is no compelling reason to upgrade from a DX7 board for a game. It doesn't look like UT2K3 or U2 will provide that either, it appears that we will have to wait for Doom3 to see the first real exploitation of DX8 level hardware. That ships in '03. How many boards that are superior to the RV250 will be available then? How many of those will cost
less then $150? Why spend the money now if you already have a DX7 level board? For demos? The people running DX7 hardware don't need any excuses, they have a list of very real reasons why they don't want to upgrade right now. The people who need an excuse are those who purchase the bleeding edge if anything.
How long since the launch of the GeForce and we are just now starting to see its features regularly implemented in games. There are many reasons to not buy any DX8 board right now, more for not purchasing a RV250 in particular(you can save yourself the cost of a new game going with the Ti200 as one example).