God, I know for a fact that I just remove stuff like that from machines, even if it comes bundled, on first sight. And when people ask "Is there something cheaper to renew each year?" I go out of my way to put them on better and usually free AV and get rid of whatever they have.
I work in a school. The other week, I got my usual email that I get from my systems, which lists the domains of websites that people have visited using the school systems that week. We list it by number of visits, so the top one is more frequent and the bottom one, some several thousand entries down, is usually single IP's or CDN's. I spotted a update.mcafee.com URL in there, right at the bottom. God, I nearly had a heart attack. Had to go track the machine down and flush it out. Turned out to be an ancient laptop that someone had found from somewhere.
To be honest, personal software firewalls / AV etc. are more than catered for by freeware. And as I like to point out to people, I've never seen a paid-for AV spot anything that a free one didn't, or clean it up any better (if at all!), and in fact VirusTotal will show you that for any file just about 70% of all antivirus packages out there will totally miss it.
The difference is, it's a real nightmare to stop Symantec / McAfee software running and get it off the PC when you do need to and it bugs the hell out of you. And, of course, they expect you to pay for it at some point.
I don't think interest in traditional PC's is waning worldwide, and I certainly don't think that anti-malware writers are suffering because of that even if it is. They're suffering because people are slowly realising that they are nothing but a miner's canary anyway, cost the earth, bug the hell out of you, stick to machines and won't let go, and slow the machine down by ORDERS OF MAGNITUDE.