I think what Disney is gonna do about character dining is that they will most likely lower the prices for the character dining restaurants once all character dining has resumed at the restaurants. As for the shortage of actor/actresses for face characters I think Disney is planning to host auditions for actresses to play princesses very soon and they will also begin auditioning more actors/actresses to perform for the character dinners. Because character dining is such an important thing for people to do during a Disney vacation it brings memories for kids to remember during their trips. And if characters do make a return to character dining they will do it in stages,
For example Cinderella's Royal Table Stage 1:
Cinderella only,
Stage 2,
Fairy Godmother will most likely meet along with Cinderella
Stage 3,
Princess Aurora and Snow White will be added
Stage 4,
Ariel and Belle will join Cinderella and Fairy Godmother
Stage 5.
Tiana will also be added along with Jasmine and Elena Of Avalor and Princess Minnie Mouse will also join Cinderella's Royal Table as well,
With a plan like this I think this is how Cinderella's Royal Table will manage it's characters for character dining when it returns to make it easy for people to see characters coming to the tables. But what the Princess character dining at the Norway pavilion? Has it returned yet also? Because that restaurant is popular in the Norway Pavilion in Epcot because of the buffet with the princesses