They should just make games. That sounds crazy, I know, but, hear me out.
No need for dev-times to.take 3+ years. Just stick to formula. Not every game needs to be bigger & better than everything else. Not every game needs to be GaaS. Not every game needs to completely re-invent the wheel.
They KNOW how to make a cool Splinter Cell game; Interesting story, 8-10 levels, just go and make it. Give the people want they know, want and love. It doesn’t need to be a shared online experience. It doesn’t need to be an epic big open world. It doesn’t need celebrity voice-acting. Just make a cool new SC game, and the fans will be happy and pick it up. Easy. Done. Next one.
Same for Prince of Persia, Watch-Dogs, Assassin’s Creed, Trials, Rayman, Brothers in Arms, etc.


