There were people even in Shaw's day who thought "Pygmalion" should have ended with Higgins and Eliza together. Including the actor who originated the part of Higgins on stage Herbert Tree who kept changing the ending himself. In the interests of consistency I'll note that such conduct was...
Glad nothing came of it.
I have enjoyed multiple cast versions of many Broadway shows, but always it's the actors doing justice to the integrity of the material and not actors leading to changes in the *storyline* to suit agendas. That is not staying "relevant" it's pandering at its lowest...
To which I would note that the version of "Show Boat" that took the greatest license with its structure and ending, the MGM-1951 version is regarded as the least of all the productions.
Restoring a couplet at the end of "You Did It" or dropping the final reprise of "With A Little Bit of Luck"...
It's not what Lerner's vision was and he and Loewe were the ones who made it a success of the musical theater. If you want that ending, then go see a production of "Pygmalion." It's because MFL went in a different direction that it became a success and it doesn't need to be tampered with...
That was *not* the "original" ending. The ending of Shaw's play has nothing to do with the ending of "My Fair Lady" the musical (which itself was simply taking the ending of the 1938 film version of "Pygmalion"). I was glad I learned about this change so I could "walk out" on that revival...