"So if instead of just not existing anymore they change in such a drastic way that they no longer makes the types of games I love anymore. To me that's the same as Nintendo no longer existing. The problem is that if Nintendo completely changes into something else their is no other option. Sony and MS are replacable but Nintendo is not."
What if they make new types of games you love? How do you know if you'll like them or not? How can you just decide you won't like them beforehand? Remember, this is supposed to be something no other game company has done before. I mean I thought Metroid going 3D would be horrible but I actually like Prime the most out of the Metroid series... If Nintendo didn't take risks, games like Prime wouldn't exist. Sure there are the VirtualBoyesque duds, but do you seriously think the industry would be better off without analog sticks, for example?
How about saving your worrying until we have some idea of what the Revolution actually does? Even if the Rev turns out to be total crap, Nintendo will still be able to recover, just like they recovered from the VirtualBoy. They've got a lot of money, you know. At this point you're just letting paranoia and cynicism twist your panties into a bunch.
If you want traditional Nintendo gaming so much, I'm sure they'll accomodate you. They're notorious for providing traditional gaming (some would say a bit too notorious)... I strongly doubt that's going to change. I'm sure the next Gameboy will be perfectly traditional and should be enough to appease any nostalgia I may have by then, just like the GBA lets me relive the SNES days.