Re: I took the Chromebook plunge last year.
I'm in a similar position, although I have a gaming PC in the den (otherwise known as the spare bedroom), rather than a PS4.
My laptop (which lives in the living room) gets used mainly for a bit of on-line shopping, or on the rare occasions when a web site isn't tablet friendly (Android), or if I'm expecting to do a bit of typing. But it's getting long in the tooth, is slow to boot, and the battery lasts about an hour at best.
I don't see the point in getting another laptop, as that's just another device to install AV on, and keep patching and cleaning etc. And I really can't be bothered these days. If I really need to use Office, I'll boot up the desktop, or break out my works Lenovo.
A chrome book seems to fit the bill, small, light, long battery life, a keyboard, and now a reasonable screen resolution, especially for the price. (The cheapest laptops with 1080p seem to be around £100+ more than the Acer).