Ah, yes. Everything must be monetized.
Very well then, let us ask what is the business model for this monetized desktop Linux?
* People who already use Linux won't suddenly decide to start paying money for support that they never relied on before.
* People who were never into Linux before aren't going to suddenly start jumping ship just because they can choose to pay for a supported distro. Let's face it, most people don't like spending their time thinking about what OS to run, and maybe that's even healthier, since the more I learn about computing, the more I realize it all kind of sucks in one way or another.
* If the idea is sell proprietary software to people on Linux desktops, it's not impossible (as shown by success stories like Steam and Matlab.) However, it also needs to compete with the ecosystem of free software, as well as web-based apps which are inherently OS-agnostic, along with the pre-existing markets like Steam.
* Before our glasses get too rose-tinted, let's remember that although Linux works fine on desktop, it's not easy. You either need to go the Ubuntu route of being opinionated and one-size-fits-all, or you need to accept that the flexibility of Linux makes support difficult. I've been using Linux exclusively for 15 years, so I'm used to fiddling with all the knobs required to keep it ticking over smoothly. I would thoroughly resent any pressure anyone would put on me to change the way I do things. On the other hand, I would never suggest to a newbie that they should try doing things the same way as me. In fact, I advise against it. "Kids, just try ubuntu first. If you like it, great. Come and talk to me again when you're sure you really want to be a weirdo."