The biggest push may indeed come from the Steam Deck. A PC in a handheld form factor, that allows you to hook it up to a monitor for a full KDE Plasma desktop experience. Very exciting. If we see a lot of people enjoy it and the Steam Deck is a success, you can be almost guaranteed that more devices will come along and slap SteamOS 3 on it and then also have a KDE Plasma desktop available.
One thing that is a problem in pre-installed systems with Linux, is that the majority of people that buy those do so for the smaller price and just proceed straight up to take them to a tech-savvy person to install Windows. Here in Brazil there are even some places that fix computers that do so for free for people (and obviously install pirated versions of W10)