I try I try I try to guess what they might do. They love control-based activity like field-recruiting and 5 meetings a week. But one thing that overrides control is money. They ditched the book study quite easily.
So, the cost of the Memorial is all on the local congregations. All that figuring out how to fit so many people into one Kingdom Hall or rented facility on the same night is not their problem......unless.....they plan to cram even more people into less Kingdom Halls.
So, here's my wild speculations on how and why this could be true. Emphasis on "wild."
1. They are actually calculating a loss of money on all those invitations. Sure, more inactive and family of JW's come to the Memorial than any other meeting. Sure, the JW's drag their "Bible studies" to the event. But do they stuff the donation box???
2. They have too many fake anointed and will stop counting. They will have regional Memorials where only the elders will know about it and will be instructed to only tell JW's in good standing who claim to be of the anointed where they are held. I mean- a genuine "anointed" must be a JW in good standing, right??? They can easily make a Watchtower magazine study for everyone else that week. This way, no need for cramming any extra meetings into a single hall on a single night.
3. It could become a special live internet thing where elders are instructed to help the old ancient elderly "anointed" ones to see it and have some wine and crackers. Others are welcome to watch at home and remember to put money in the box next Sunday.
I don't really believe this would happen. They currently still say the Memorial is "the most sacred event." But hey, I really believed Donald Trump would never win his election.