Seeing so many good people that have contributed a lot to KSP and this nice 1.2 update leaving the team is sad. But they have their reasons to depart and I respect that and wish all the best to them and I am really grateful for all their love, passion and all the work and time dedicated to this game. I hope some of them can still contribute to KSP through mods (and I will donate or already have donated) or they can contribute to or develop new games as KSP still the one that consumes most of my time allocated to gaming, but it is not the only one.
Surely, since HarvesteR and other important people have departed from the team, KSP has not fell apart (credits in part to the member of the team that have now departed ) and it is in its best shape with this 1.2 release awaiting for many ours of fun. And I am pretty optimistic to think that Squad and the new devs and those who stayed will keep KSP development as they said for many years to come.