Death of the Formal Lounge and Dining Room

Do you ever use yours?
Over the years, we've found that all our visitors gravitate to the kitchen, meals family and rumpus room. That's where we're all relaxed, chatting and drinking freshly brewed coffee, snacking, kids playing in the rumpus room or outside or watching TV.
Good food, good wine and great company.
The Formal Lounge and Dining Room were untouched and uninhabitated, desolate areas ....
Well, until this year.
With both kids now in secondary school and for some reason that's evolved over time, they both don't use the desks in their respective rooms to work. They just don't do homework in their bedrooms.
At first, DS was the only one working downstairs and he's basically taken over the study.
With DD starting a new school this year, she had begun to stake her territory downstairs too.
I looked at my pristine red mahogany leather lounge suite and formal dining suite and pondered...

Two months ago, we lined the dining table with a surface protecter and a heavy weight upholstery material (on special at the local haberdashery store) and voila, the dining room table is now laden with laptops, screens, books, pens etc.
We've yet to get small bookcases for them but pretty much I now have running shoes, sports bags in my modified mobile kitchen trolley and school bags leaning agst walls in there.
As for the lounge, that's become the music room with 2 guitars, music books and piano. The piano has always been in there but there's no where else in the house where the table (coffee table) and seat (my pristine lounge suite) is the right height for practising the guitar (DS does classical).

I've been told that new house plans nowadays are being to do away with the traditional living areas as well.
Have you changed yours as well?