I doubt that a radio interface will change much about the price. I don't think the WiMAX hardware in the N810WE made it much more expensive, so why should HSPA hardware change much about an "N900HE" price-wise? I don't get negativity regarding cellular network support on here.
By the way, today, a N96 is cheaper with a plan at a provider than the N810 is. So no, I really don't think it will kill the platform.