Yeah, I saw multiple channels on Twitch as of late. Weren't either not there or not as notable even a year ago.
Still - IMO - kind of boring to watch.

Apparently not really.

Using the brain is quickly dying out too.

On that point I agree wholeheartedly, but then I find watching people playing video games just as boring, if not more so, and we all know how big that is today.

So, what type of kit *are* you talking about?

There are some mice with extra buttons on top but I don't know if they are autofire,double clickers or can be remapped.

It would be nice if the razer boomslang ballmouse made a comeback. The last version was made by a german company so I don't know who has the production resources now.

Some can be remapped, but it's still not the right placing, with the wheel getting the usual, central, position and a little button next to or above it. When I had the Logitech MX518 I had the button above the wheel as middle, and same on the Roccat Kone XTD I eventually replaced it with, since it had the same button layout and in fact the buttons on top were larger and seemed actually intended for use. But that was rotten in terms of reliability (and I don't mean compared to the MX518's already legendary reliability, but even some very modest standards). The Kone AIMO now at least just made it past 2.5 years before getting iffy, but this doesn't have the button above the wheel anymore either, so since I got it I've been having to make do with clicking the wheel as middle button for the first time ever really, and I still say it sucks, and still occasionally accidentally scroll instead of clicking even though this has a darn solid and steady wheel.

I can't see anything on that site since it's paywalled, however it appears to be measuring market value and not player base.
Electronic project kit

It shows the global board games market value from 2017 to (predicted) 2023.
The numbers are steadily rising.

And sorry, but your cheap attempt of trolling doesn't make you as smart looking as you seem to think it does.
Who do you believe buys all these board games? All bought by the same stagnant number of board game players?

Or - to return your logic to you: who do you think is buying all these PC games? Think, they are all bought by a stagnant number of PC game players?

Quote: "The global pc games market was valued at about $27.73 billion in 2018 and is expected to grow to $30.71 billion at a CAGR of 2.6% through 2022."
https://www.businesswire.com/news/home/20191107005499/en/Global-PC-Games-Market-Analysis-2015-2019-Forecasting.

Edit: According to your "logic" there are no new players in the board game scene, so - consequently, there are no new players in the PC games scene.

That's still (/again) very current in the synthesizer world.
I have this one (attachment) from 2014 sitting behind me.

Of course. I didn't mean to say these things don't exist anymore. Lots of things are still analogue and operated by buttons and switches. I just meant that the average (young) person listening to music or watching television nowadays would usually use their PC or phone or mp3 player, or a remote control.