If you type similar words to my title in Google you can find a bunch of threads from years back where people were talking about the possibility of a 40+ megapixel FF Canon DSLR. Back then many were laughing at the chance and a lot remark that higher pixel levels are not the ''be all and end all''. But why not, why is it not necessarily important, after all the likes of Hassleblad are making digital backs up to 60 megapixels.
I don't have wall big enough to hang huge prints but it would be nice to know I could if I wanted or if I got that perfect gallery shot, or just that I could crop more without noticing the loss in detail.
So essentially my question is:
Other than using hard drive space is there any obvious problem with 40+ megapixel cameras. Can L lenses cope?