Don't see how, x1950 is gona run DX9 games maxed out fine just like the G80/R600, only advantage they have is the new DX9 games will have the odd DX10 feature bolted on, the x1950 will last well into next year, theres ppl out there who are not going to rush out and buy the first DX10 cards as they know that by the time DX10 is more used, and that its worth buying a DX10 card for, then the G80/R600 will be well old hat and a load of new DX10 cards would have been and gone as well, its also a good upgrade for those who have lower spec cards like the x8 series, or the 6 series.
Im not planning on getting the first lot of DX10 cards, not just for a couple of DX10 features bolted on, waste of money for me, ill just play them on my x1800 in DX9 until DX10 is being used more and worth buying a card for, DX10 games aint going to flood out as i said they'll only be DX9 with DX10 features bolted on, they may have a bit better water, or lighting and thats it, so why waste £350+ on that if the DX9 card you already have is cutting through the games, which the top end cards of today will be.