The never ending growth thing is complex. But set all of that aside, if your company doesn’t peruse the growth, somebody else will. There is no future where nobody bothers to try and sell to a market that is begging for a product.
Nobody needs Microsoft to exist, but people want free software and services (windows is functionally free, the last time I paid for it was win7). They can take a privacy purist route and change $3-400 for a license w/ an update every 5yrs but the product will die and everyone will switch to chromebooks.
Microsoft can “be better”, and then they would stop being relevant. If you want a little better, pay the Apple tax, if you want A LOT better pay the time tax and use Linux.