Looking at the speculation now that Hybe/Source Music are creating a group around Idols that already debuted (Izones and more). It just seems to me that this is a fortunate solution with the disbandment of GFriend.
I really do think Hybe/Source Music wanted to keep GFriend but probably at a certain price. What was offered to GFriend and what GFriend wanted was probably too far apart that they couldn't come to an agreement in the end. That is why the disbandment talk came at the end of the contract and not sometime last year.
If Hybe didn't intend to keep GFriend. Why did they integrate them into the Museum? The opening of the Museum and the confirmation of GFriend disbanding was only 4 days. GFriend was also in all the marketing of the new Building. That doesn't seem like moves that a company would do if they didn't intend to keep them.
Also not taking a side because both sides could feel they were right in the end.