I think what we may start to see in lieu of "Touring" is more bands having residencies and becoming a "Destination Event". For example, if you want to see the Melvins, they are playing 3 nights a week at the Echo in Los Angeles over the months of April, May and June 2021. This means less travel for the band (saving money on hotels/gas/vehicles/meals), less time spent loading in/setting up/breaking down/loading out, more time at home with their families, less chance of getting sick - and with all of the restrictions/rules/regulations at the federal, state and local level that are going to come with doing shows post-COVID - fewer headaches of having to figure out how to adjust for each market when touring. Dont' even get me started on how people would do that going to different countries as well. The artist would be able to settle into this fairly easily, and I believe that the fans will settle into this very easily as well. Travel to concerts is something I personally love doing - I have done it many times and have flown overseas for it as I know other people on this board have done as well.
Can you imagine a vacation like - "Hey, we are flying to Los Angeles to see the Melvins do a three-night stand, followed by seeing Artist B and Artist C doing their residencies and then we might catch the Melvins for another three nights before we fly home."
It's just a thought, but I don't think things are ever going to be going back to the way it was.