@kungras. Hey 
The best one to look at is the japanese one, since there is no "bundling" argument in that trend, just the games pure and simple. The data was taken from vgchartz, and extrapolations are there purely for aesthetics (to not have gaps in the lines, I fabricated a few gap values, they are simply there to create a straight line btw 2 points) :
The most important line is the green line because it eliminates the 2 most important irregularities of the franchise: Super Mario Bros. 2 and NSMB. If you look at the green trend, you will see there is a natural progression from SMB to M64, and it's downwards, naturally downards. The jumps from NSMB are due to what are called revivals, and you explained it pretty well related to SF. Despite no overload happening for Mario in contrast to SF, stagnation was an issue, and the trend started at SMB3.
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