We have a river cruise booked for May 2021 (booked back in January before we had any idea the extent to which this would change our lives). I am not buying airfare until I see the path forward taking shape and feel like we'll really be able to enter the EU. Heck I have a "backup"
DCL cruise booked for next November now and its the same thing - I am NOT buying airfare or PIF until I am certain things are "back" to a (new) normal. There is no way I'd personally be OK with another nonrefundable vacation right now without knowing what I am paying for - we've already lost too much money in 2020.