If you subscribe to the Wall Street business view that every table must be turned rapidly and every table must generate the maximum amount of revenue or the patron must be booted from the premises, then yes -- Disney did absolutely the right thing in deciding that one must order a full tea or get out of the restaurant.
I returned recently from two years' living in Europe and it is totally different there. You can walk into a restaurant, order a cup of coffee and sit there for hours. You will never be asked to leave and you will never even be asked if you would like your check. You will never receive a check until you request it.
Dh and I have had afternoon tea at GF more times than either of us can count. And, I have never seen anyone with a book and a pot of tea. But, honestly, it doesn't seem to be the end of the world if I did. We often see empty tables in the tea room. We always order the full tea, so it makes no difference to me whether a la carte is available. But, honestly, I sometimes wonder if there is one inch in the entire 45 square miles of WDW that isn't gone over with a fine tooth comb by the bottom-liners determined to squeeze one more thin dime out of the facilities. It gets really tiresome.
Dh and I once went to a park restaurant (which shall remain nameless) in a WDW park (which shall also remain nameless). We each ordered a rum sidecar with our drinks. And, we were absolutely shocked at the very generous pour of rum in a nice snifter that each of us received at a surprisingly inexpensive price. We looked at each other and laughed, noting that we should enjoy this because as soon as it is discovered that this WDW restaurant is serving up generous pours of rum for a decent price, it will be stopped.
Everything is not always about the almighty dollar (or I guess I should say Euro because in the U.S. it truly does seem that everything is about the almightly dollar).
Fascinating to learn if a patron orders a pot of tea and a scone that "WDW can't make enough profit on such orders". Really? I mean, really? One of the largest entertainment conglomerates on planet Earth and WDW can't make sufficient profit if a person orders just a pot of tea and a scone?
It's at this point that I'm inclined to say, I'm done with tea at WDW. I'll head to Peacock Alley at the Orlando Waldorf where one actually can still order a cup of tea, read a good book and not be bothered, thank heavens.
And, afternoon tea developed as a way to put something in the tummy because the Duchess got hungry between lunch and dinner (dinner often not starting until 10 pm). It can be social, but also is often solitary. Lady Margery often had tea by herself at 4 pm in the library on Upstairs Downstairs.