I'm not sure if Linux will ever become mainstream. People tend to value things that they spend money on, and believe in all the marketing and hype. They have an apple product for example, so they can show off to others what they have, and it sort of makes them feel like successful and important people.
Linux is like a different mindset and way of life. I just want something to work, and be unassuming. "No frills". I think the best way of getting people to understand/appreciate Linux is to actually have them try it temporarily. That and word of mouth. It will gain traction due to irritations with Microsoft, Apple, Google etc. People don't tend to know or give any importance to Linux, it's the sort of thing people hear about once in a while but overlook. The reason I switched is because my hardware is old and new Windows runs worse, and also has annoyances like their constant pushing of their products when you log in, having to link a Microsoft account with everything. I'm glad I switched, and I have converted a couple of others to it. It's a hard sell, but once people get used to it, they are happy with it. People fear that something new is difficult, but they were surprised how easy to use and versatile mint is.
In terms of the Linus tech tips episodes, they felt anti climactic. They seemed half interested, but at least Luke stated that he permanently switched his laptop to Linux. It seems to me that some of Youtube channels are getting annoying, trying to be edgy, making rubbish jokes that can be insulting, or putting videos out with a lack of substance and covering the same ground over and over again. It looks a bit desperate and entitled. It's like the more they lose viewers/subscribers, the more controversial they try to be, which ends up making things worse. I'm not saying this applies to Linus tech, but I am just airing some of my discontent with Youtube culture in general. I value humility, and I think a lot of Youtube celebs get greedy and build egos.