I don't see this operating model lasting for long. The natural progression is likely to be toward either end of the spectrum: fully remote work or fully on-site work.
Leasing, building out, and equipping an office that is only used for 2-4 days out of a seven-day week makes absolutely no sense.
Companies will of course go to hoteling to reduce office space. Several big banks do that. You don’t have a permanent cube. You reserve which cube you will be in - and you can only reserve a cube 2 weeks in advance.
Of course this begs the question of - “why come in at all then?”
I like hybrid. The best of both worlds. Like 2 days/week in the office. As the days can be staggered, just lease half the space.