First of all, all Sega did was take Nintendo's franchise, and continued on it. Second of all, Sega's out of the business of consoles, and people are mad, now they want Nintendo out of the business. Many of the people who claims Nintendo would go third party are Sega fans who wish to see the same fate happen to Nintendo.
And finally, one crappy game is what you call love from Sega? Again, you failed to mention that Sega was the first to start pulling games from the GC with their sports line-up. Then released Monkey Balls 3 or whatever on every system except the GC.