We bought our last house 14 years ago with an open plan kitchen lounge. Before that I'd lived in Australia in a shared house with an open plan kitchen lounge. Both were a hundred times better than a separate kitchen you are isolated away from everyone else. Quite honestly I wouldn't want to live in separate rooms, as I like being social whilst cooking. I have memories of my mum always been stuck on her on own and never wanting that to be me.
When we moved an open plan kitchen / diner was the very top of my wish list. The kitchen was the thing that sold us the house. Its huge. And yes it has an evil island.
Its been great though. It has plenty of storage. We have a table we stick on the end of it so we can fit 11 around the table and island.
We have a large group of friends who we see (saw prelockdown) a lot and we all entertain. Seeing as we know them from scouting, lots of them like to be outside whilst i dont, so the inside/outside thing with evil bi-fold doors is perfect for us.
We have additional space for another table in the kitchen area, so have just bought garden furniture we can bring in the kitchen for the winter too.
The thing is we didnt want an island, open plan or bifolds because they are fashionable. We wanted them because they are the most practical solution for our lifestyle and the way we like to live.
I think this is where the problem lies. Not everyone wants to live the same way. My idea of hell is being isolated in a kitchen but others like that. And people follow fashions rather than thinking about the way they live/want to live. And you have designers pandering to this fashion in houses which are too small to accommodate the design and actually living day to day in it.
I couldn't care less whether its the fashion or not. Its what works well for us.
So i dont think islands will disappear. I do think they will be removed from poorly designed kitchens by people who didn't really think about it when they put them in.