I humbly disagree.
Any serious landscape photographer will use a solid tripod and low low ISO.
Even on the tripod...
Moments happen - a billowing of clouds over the rockies; the moment dawn breaks; the leaves in an autumn wind; the capture of a fleeting light beam in a slot canyon.
The world does not stop to match a long time exposure just to accommodate ISO 100.
Having the exposure range to take advantage of challenging conditions is important - sometimes its all you have to capture a magical once-in-a-lifetime moment nobody else will get.
Sure, high MP has its advantages and I am sure many will get great images that way.
But it will not do everything, even if everything you do is on a tripod
(and yes, most all my shots are Manfrotto tripod, mirror-up, wireless remote trigger)
I applaud Canon's efforts to fix noise, improve DR. Nearly 1 Stop better on Raw over the 5DMarkII is quite good for me - over an already incredible workhorse landscape camera.