Just because it's too Japanese/Anime-esque; it doesn't mean that there isn't anything you can do for it.
Pokémon is limited in essence (not just because the IP not having many things that can work for a full on Attraction; but more of who owns the IP); but IPs like Mario, Donkey Kong, and Zelda; iconic video game IPs that have countless amounts of storytelling and has been in NA ever since the 1980's; people will come. Same thing for Pokémon, people WILL come and people WILL want to be experiencing the worlds of the IP's that Universal uses from Nintendo's vast array.
As for SLoP; it will never be a full island. Imagine something like Kong in this case, a transition from one area to another.
No, not exactly. Toon Lagoon has been an area where it is cartoon based (Popeye for instance, and even Dudley Do Right); as they are all for the most part, apart of Classic Media (which is being bought by Comcast alongside DWA.
And keeping in mind, Illumination and Nickelodeon has in essence, tons of cartoon IP's that Universal could use for theme park use (including one that's being use, that in which that I think will leave but I don't think it'll be gone for too long).