You know? I think Nintendo should consider recycling the character slightly...
I mean, if the games with an antagonist called "Bowser" are getting a bit to predictable, then why not twist the plot a bit?
What if Bowser, rather than kidnapping the princess, would instead threaten to destroy her kingdom what some weapon of horror if Peach does not marry him. Kinda like the land is the hostage and the ransom is marriage.
The princess does not get kidnapped, yet Mario goes on adventure all the same, and he goes defeating Bowser, and tries to stop the monstrosity of a threat later --- somehow...
That would be cool. Maybe, something wierd might happen, and the threat gets a mind of its own!
How about on this adventure, Mario goes through several outposts which try to stop him, or at least slow him down, in which those outposts contains some bosses - say the Koopalings - where we could play a Super Mario game like we did way back during the days of either Super Mario Bros. 3 or Super Mario World!
Think about it...
I am a pure Super Mario lover!!
...and in no point in the future will he ever be abandonded by me!
I will even drawn the best Super Mario comics ever to exist!!