First point, I sorta agree, but it really depends on circumstances. Mario and Donkey Kong are both the same type of game: platformer. Nintendo seems to prefer other non-Mario platformers to be made by other companies, like Kirby and Yoshi. 3D Donkey Kong was made by Rare. When is the last time that EPD made a non-Mario platforming game?
Second, still nah. It would have been released, leaked, or teased by now.
Third: Money, and the fact that we don't have a new mainline 2D Mario game on the system. We have a Maker title and a port.
Fourth: Well.... It could be worse. You could be a F-Zero, Earthbound, Golden Sun, Wave Race, or 1080 Snowboarding fan. All were great franchises that Nintendo abandoned.