Maybe once Polyphony Digital dashes itself against a wall.
Watching the Digital Foundry videos on TLG makes me wonder how far along that game was when it was sidelined. It doesn't seem to have changed a whole lot. Don't think they actually spent all that much money on it since the PS3 version was shelved.
My thoughts on TLG at this point is they probably funded Ueda and his small team for a few years and the game ran like shit & was full of bugs and they couldn't get it to be fun so they canned it. Then there was a huge fanuproar for a couple years and Sony thought it'd be worth the brownie points with fans to just port it to ps4, finish it up and get it out regardless that it was full of bugs and the main gameplay loop still wasn't particularly fun.
I feel like TLG is what FF Versus would have been if they released the unfun mess of Nomura's version three years ago instead of canceling and having Tabata make a completely new game (which had its own problems).
These games remind me of Balrog's big Space Sci-Fi game he spent years working on after God of War 2 only for the project to be cancelled. It probably wasn't particularly fun either.
Aka, yeah I think sometimes games are canned just because they can't figure out how to make it fun, and while sad, that's fine.
Though I'll be a hypocrite and say as a game industry recorder/observer/historian I'm glad TLG did come out so I could play it and see what was there, even if it wasn't particulalry fun.