Anything Apple is likely going to be the thing most people move to. As everything, they’ll need is either pre-installed or able to be found on the respective storefront. I personally want Linux to come into it’s high popularity era. However, the realistic option is an Apple product which suits a person’s needs. I am getting a Mac Mini just for the proprietary stuff I need to manage my iPhone, as it wouldn’t work on Linux.
There are PC sellers who sell Linux Desktops! System 76 is a USA example of a retailer who does sell PCs with Pop_OS or Ubuntu preinstalled. It does hurt to not have these PCs available in big box stores like Walmart or Best Buy. As that would make Linux visible and readily accessible to a potential buyer.