Ordinarily, I agree with assessments like that... but in this case, I'm not so sure.
If photography is about still 2D images in 50 years, then I think it's not too far off. In that case, it's all still about composition and capture and whether or not you can print a reasonably-sized print. The M9 years from now (assuming they don't all fall apart) will be able to do those things as well as it does today. Today, it competes with all previous photographic technology, and produces stunning results.
Given that there are 50+ year old photos that are as incredible today as they were 50 years ago, I see no reason why the M9 would atrophy significantly in ability to produce excellent images.