What’s unfortunate about it for anyone but NBC?
Michael’s promotion to GMA was a directive by Robin IIRC and an attempt to assemble a more dynamic cast after the departure of Sam and Josh and the failed experiments of Tony Reali and Jesse Palmer. At one point the lineup was Robin, George, Amy, Lara and Ginger which while each incredibly strong in their own regards is not a particularly dynamic ensemble.
ABC has somehow made the Michael appointment work really well. He’s still by far the weakest of the ensemble but somehow it works. Robin and George have also become a classic duo. Amy was a perfect fit for the show as well and TJ made a lot of sense too. Losing those two and Cecilia is going to be a tall task to rebuild.