So because Cloud is in Smash SE has big plans planned for Switch but at the same time they didn't reveal anything FF related at the Switch event but instead DQ and some other games. That's a stretch if I ever seen one.
Truth is Cloud in Smash means absolutely nothing. It's just a most popular and recognizable character in the franchise so if SE and Nintendo wanted to put a character in Smash of course it would be Cloud.
Switch will probably get some FF spinoffs just like 3DS but that's it.
Judging by Ryu in Smash we can look forward to a port of the original game with Emo Cloud and Nice Sephiroth as bonus characters.
Everything else are extremely late ports (romance of the three kingdoms, nobunga, disgaea) so I'm expecting low sales like you. i can't blame gamers for not going mad about them for full price.
I'd hope Disgaea does decently though.
Personally I'll be picking up Disgaea 5 day 1 in the UK but it's definitely not going to do well.