Imo, people put too much emphasis on that "megapixel" thing. In fact: it only tells something about the size of the printable result.
What stops me from going digital is:
1/ I have a good camera (Olympus OM4Ti)
2/ No digital camera matches (yet!) the quality of slides
3/ Due to the fact that the sensitive surface that replaces the film is smaller, no wide-angle lenses that match a 20mm or less lens in traditional camera's are available for digital camera's. And what am I without at least a 24mm F:2 wide-angle lens?
4/ Apart from the camera body, I would need 20 GB and at least five battery sets to survive three weeks of trekking; the 20GB with its own battery pack, and the camera packs would need a reload every evening. Meaning I would be forced to set the tent on campings, and pay for electricity.
5/ I wonder whether the digital camera's will survive real nature photography (seasalt, humidity, high temperature, shocks,...like the traditionals can.
6/ at www.dpreviews.com , *the* site for good advice (imo) there is always something not yet perfect with the camera's.