It will probably be 5 sports for $40 after they release them all. Its kind of hard to sell you the full game before its released. And i dont think they want to announce something like that now as it would lower the initial sales

There is no logical reason why you would do that with either of those games, they don't lend themselves to such business models.
The Sports series on the other hand does though I don't think fragmenting is a term that applies here. I'd say it was fragmenting if you for example had to get a certain high score in Bowling in order to unlock a mini game in Tennis, requiring you to purchase both games for the full experience. This is however not the case. Every sport can stand on its own, mini games, leaderbords, local and online multiplayer, the whole package, a complete game.

If Nintendo had released a sports game a month and then announced that all those sports games were getting online and they would all be part of the same online community a lot of people would probably change their opinion.

That said, I believe Nintendo will eventually come with a bundle pack, they'll roll out sports every couple weeks/months for a while, until they have enough to justify a full game price tag. In the trailer you can also see that it says "Download Version" instead of something more excluding like "Only available on the eShop".