f***ing hell, it's worse than i expected. Sony is already running out of cartridges for 2018 according to Limited Run games.Which is why they had to limit Salt & Sanctuary to only 1800 units... However, they made no such announcement for the PS3.
An opportunity perhaps ?
In any case, i can turn to Hong kong (e.g eastasiasoft)
should it stop by March 2019.(I feel like i won't have enough time for making a decent game by then)
I'll ask them some questions asap.
Also as far the 3DS was concerned, you're right. It seems they only accept the CIA format.
In fact with a CFW, it's possible to export a Unity game through the 3DS export module and run it.http://nintendo-ds.logic-sunrise.com/dossiers-et-tutoriaux-1005917-3ds-faire-un-jeu-3ds-avec-unity.html
(It also turns out that Unity can run on the old 3DS, just with severe limitations)