Why did Nikon choose 36 megapixels ? - why not larger ?

exRhodesian wrote:

If so, then in the same sized DSLR would it be possible to have 80-100 megapixel ?

I relate the same as, for example, to let's take High-Jump at the Olympics where each time they try to break the previous record. So suppose the current record for High-Jump is 3.5m and each time they jump higher and higher. Does this indicate that in a few centuries time the High-Jump record could be 10 metres ? Absolutely not as there must be a limit.