An interesting article about Titanfall 3
Electronic Arts didn't cancel Titanfall 3, Respawn did—and it didn't even tell EA for six months | PC Gamer
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Respawn had been working on Titanfall "in earnest" for 10 months before deciding that battle royale was the future.
I think the prospects of a new Titanfall game will depend on how spread thin the devs are and how many windows of opportunity there will be. Crazy how many projects they have worked on and are working on right now - literally babysitting DICE with Battlefield 2042, just finished Jedi Survivor, have 2 more Star Wars game and then another standalone titles in the works. If the team has to 'assist' aka take over development of a new Battlefield game then the prospects of another Titanfall will take a huge hit, more with time constraints that a direct internal competitor.