I don't know... we got some great TV out of it, and some roles/actors can't be recast...those who grow up on the show like "Robin" or " Sami" especially so. You lose all the great backstory shots of them at different points in their lives. And can you imagine anyone but TG as Luke? (Or Fluke?)
I was glad to see what we got to see...the Emma/mom reunion, the Robin/mom reunion, the Scrubs reunion... And they gave Robin probably the ONLY possible reason for leaving....to save Jason's life. But I agree, it drops Patrick right into limbo plot wise. Are they really going to have him divorce her? Have her come back,take Emma and leave town?