I still havent finished it. i loved the battle system, i had my gripes with other aspects of the game... so much pottential for SMT6 i would say.
Nope. I thought about that, but even with nintendo funding, there is a limit how much they can sell, compared to a multiplat release, and how much they earn on persona merch.
And before you say "do both"... they dont have limitless resources. with SMT moving from Handheld like graphics (SMT4) to way more involved. And seing how many developers struggled to up their teamsized without geting to expensive for their own good, i asume they wont force growth just for a niche title (and with the sales of the first one...yeah...)
(My opinion on the first one: the idol theme was to much for me. all i heard sounded good, but a JRPG where i dont like the story or the presentation (color palet, idol theming) was just not my jam. so call me biased if you will, but it really did not light the sales charts on fire.
Im actually not a fan of those random inclusions of non canon characters in other properties, but to everybody their own. I also found the nintendo costume sin Bayonetta 2 really out of place. (but it wasnt forced to be used, so whatever)
In regards to SMT being nintendo... i would not count on that for to long. Seing how there where hints for a PC release of SMT5, i could see both series going multiplat, but htem starting first with the obviously more lucrative one.