People will not tolerate not being able to buy new appliances with 1363 plugs on them. The cable colour change did not impact the man on the Clapham omnibus one iota (unless he was an electrician), but a plug & socket change would. Whatever any standards committee may think has technical merit, politicians, no matter what their faults are in other areas, are pretty good at knowing what will fly and what will not.You would still be able to use other systems, as you can now, but I would expect that The Plugs and Sockets etc. (Safety) Regulations 1994 would be changed, and the norm would be the new arrangement.
And Auntie Gladys not being able to have a new toaster unless she has her kitchen rewired is a dodo.
Additions may come about. Removals will not.I am sure that changes to our system will come about in the not too distant future. I am not too concerned - changes happen.