Quoted from HoakyPoaky:With the time travel element introduced in Rebels, it's entirely feasible to do. I'm sure Filloni & Favereu are behind this, and have a general overall plan for tying their series into a new timeline trilogy. They can shape it however they want so that everything AFTER the Mandalorian is tossed into Legends status. SJWs will cry out in mass. It will be pretty funny to hear this small vocal minority drowned out by the rejoicing old fans.
Most people would love to see Episodes 7-9 tossed, see how Baby Yoda ties into a new timeline Episode 7-9, Luke's proper Jedi Academy, Mara Jade, Thrawn, on & on. I say go for it Disney! Better than just damaging a multi-billion dollar franchise & just walking away from new film projects.
As far as the actors ages, Carrie Fishers death, etc.... doubles can be cast for action sequences. Hollywood-quality de-aging tech & deepfake face mapping look almost photo-realistic now. Anything is really possible, especially in 3 years time before these films are even close to being in theaters.
"Time Travel" the last refuge of the creatively bankrupt.