I suppose that in the best case scenario if the card was released (probably at very high costs) as originally intended together with the 5500 and 4500 cards and without the whole external power supply logic that should have never even been thought as a paper concept considering the 5500 had already the PSU connector, maybe.. maybe it could have had a very thin market in few numbers of very expensive cards that anyway would have found difficult time compared to slower cards that probably costed much much less and were enough close to real game speed.
At the end the Geforce2 Ultra was indeed a fast advanced product but its price was at the limit of those times and at the same time never oriented for a common high end gamer. But its cost had a reason to be there considering the period, the alternatives and the technology it had.
The V5 6K to have a similar position imho needed a short cheaper layout, the internal PSU connector (that probably was oriented to have at last considering the PCB power points but the external unit idea was unacceptable), possibly an higher clocked 180nm built VSA100 and of course the time factor that was the most important. But anyway too much effort for a design that needed since the Voodoo3 to be completely changed for a new architecture totally redesigned.