SEGA isn't being bad for not funding the game, infact, SEGA are being pretty dandy in allowing Yu Suzuki to do whatever he wants with his own game.
Fact is the first two lost SEGA money so they weren't going to fund it in any shape or form, however I don't see them not promoting it or helping Yu Suzuki out like they do with all their friendly developers like FromSoftware, Index etc in some form or shape.
Lost opportunity? Maybe, but outside of the Yakuza team all their console teams capable of making Shenmue III are working on bigger franchises than Shenmue, just plain fact.
There has to be some sort of minor funding on Sony's part. Why else would it be exclusive to the PS4?
Also, pretty sure these are nowhere near final assets.
It's easy to port to the PS4.