I think it probably will be their last console, not because I think they'll drop out of the industry, but because I think the idea of traditional "game consoles" is going to be phased out over the course of the 8th gen and going into the 9th gen. Hardware is likely going to become a lot more open, more customisable and such, so it'll be interesting to see how Nintendo adapts to that.
But if they did drop out of the industry all together, I don't think much would change for me. I already use the PC as my main platform, PlayStation for most multiplats, and Xbox for the few good MS exclusives.
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