Don't you actually want higher resolution and more detail? And, you believe that you get that from more MP's?
Okay, maybe I'm confused, but aren't higher resolution and more megapixels the same thing?
Due to the effects of lens diffraction, you reach a point where smaller pixel size does not yield more resolution or detail.
There seems to be some debate as to whether we have reached the diffraction limits of current lenses at 18ish MPs, but I'm not really looking to debate the technical feasbility of it. I'm asking whether or not an increase in MPs would increase my ability to get printable results in my circumstances or if there are simply usage/technique changes that I need to make. Some of these crops are all the way down around 1200x800 which is questionable for even a 5x7 print.
If you are making money from landscape photography, perhaps your work will pay for a move. If its for personal use, your finances are going to determine that.
I think I'm hopeless as a landscape photographer even if I wanted to be one. As it is, I'm just earning enough to "support the habit" doing sports event photography.