Reading the replies, it is interesting to me to see the range of accommodations that people are willing to make (or not). Travel is definitely not a one-size-fits-all, and it is good to keep that in mind as we see the trickle of tourism returning.
We and another family (10 people total) have plans to travel to Germany, Prague, and Spain over Christmas and New Year's this year. No money on the table yet, everything fully cancelable. In a couple of weeks, we will have a group conversation to confirm what we are all willing to "put up with" to enjoy the trip and then make some decisions about how long we want to wait to go to backup plan #1 (a trip entirely to Spain, since I think Germany is likely to be more restrictive for a longer time) or #2 (a US destination).
Even before having our group conversation, I have some general ideas about what's important to us. We are fine with wearing masks; we do it all day long anyway -- healthcare workers in the family, kids wear masks at school, masks on in all indoor public spaces in Vermont. We are fine with testing -- just something to work into the planning, if needed. We are all vaccinated except for my 15-year-old, who will be signed up for a shot seconds after the FDA comes through with the Pfizer approval for his age group in a few days.
But, as this is a first-time trip for several family members, we wouldn't go if major sights are inaccessible. While we expect to do lots of just "hanging around" time (we are very slow travelers), we do want be tourists and visit museums, castles and cathedrals, go to indoor concerts, etc. If we can't do that, we will likely seek out a destination that's just about down time (hello, Florida Keys....) and try again next year for Europe.
And although I would not call us "foodies," food is a large part of the enjoyment factor of our trips; we spend enormous amounts of vacation time happily sitting in restaurants. Eating different foods, sampling local fare, chatting over meals, are really important parts of our travel time. So, if inside dining were restricted, we would re-work or postpone the trip.
And finally, I have to say that a large part of enjoying our travels to Europe has been about interacting with a ton of people -- taxi drivers, apartment owners, waitstaff, ticket takers, tour guides, it goes on and on. Those conversations seem to be where we learn the most about what life is actually like in the places we visit. So, if for some reason it seems as though those interactions might be limited by social distancing and other COVID protocols, I would want to postpone our trip.
I hope everyone can get back to traveling with all of their expectations met soon.