Jaffa informed me that my first post might sound like we're concerned about tmo only, and plan to ditch some/anything else.
Of course that's not the case, there are like almost 20 service domains and we try to keep (almost) everything alive and as unchanged and free of disruptions as possible. It's just that tmo is the first victim suffering the impact, so next two weeks are first instance about keeping it alive without downtimes. While we deal with all the rest in parallel but expect 'doomsday' some days later for that stuff.
Thanks Jaffa for the hint.
/j