I don't know about Windows, but it will take a lot more enshittification than that to burn down the Office brand. Excel alone carries it to dominance.
Word, Excel, maybe, but the MS strategy is vendor lock-in not any actual productivity. We see all day long how AI burns down silos and enables cross-platform coordination.
I bet MS saw this too and the “CoPilot Everything” pivot was their failed effort to maintain vendor lock-in in the age of LLMs. That failed, devalued their product, since they doubled-down in the meantime on enhanced hostility to cross-platform tools (try lately to read LLM markdown on vanilla M365?) now MS will have that reckoning after conceding a 3-year head start to disrupters and, yes, antagonizing core users with uptempo customer-hostile slop.
The Office brand is literally gone, they renamed it to "Microsoft Copilot 365 app". Check https://office.com