I suppose it is only fair for the 3DS to get a "doomed" label.
I mean, the PS3, X360, Wii, PSP all had "doomed" attached to their foreheads (or maybe their casing) at some time or the other according to the "intelligent" experts.
Most - if not all of them - seem to be doing relatively OK so why should the 3DS buck the trend.
I still will bet that the 3DS break all sales records over the Nov - Dec months.