Fortunately BSM is a fairly small group trip. Less than 40 people IIRC, which makes it a bit easier to maintain social distancing when visiting venues. So, I don't think it would be radically altered. But there will certainly need to be accommodations made. Some sticky points:
- The first half of the trip involves riding your private motor coach (bus) which puts you in close proximity with the rest of your adventurers.
- Meals are typically in private rooms some of which may be a bit small for adequate distancing, especially the visit to the Tam O'shanter.
- You visit a lot of public spaces where adequate cleaning of surfaces cannot be guaranteed by ABD, especially the Hollywood portion of the trip.
- Exclusive tours of some venues (Chinese Theater, Jim Henson Studio, etc) are dependent on those facilities being willing to accommodate a group trooping through.
- Stops at Disney facilities in Burbank (Walt Disney Studios) and Glendale (Imagineering) are less of an issue as Disney will be maintaining appropriate safeguards for their own CM's.
- Once at DL, again Disney will be following some safeguards for the general public and for the backstage areas. How much this will impact ABD remains to be seen.
During much of this trip your group gets decided into two smaller groups. To meet appropriate distancing guidelines, I wonder if the groups will need to be smaller, requiring additional guides.