Did the author need to crank out an "article" before the weekend?
This has been talked about for decades. It's not going to happen. The entire range is unusable at the networking core level, even if you magically had an OS that accepted it.
You can't tweak IPv4 any more. Accept the fact that while IPv6 may seem scary to some, it's the way we _must_ move.
Networking is not scary, learn it.
IPv6 availability is far from universal. I have 8 fiber ISPs to choose from. Zero of them offer IPv6.
That said I don’t feel there is any meaningful technical barrier to using 240/4.
My gigabit fiber provider only supports IPv4. Granted, they're just a VNO, using PPPoE on top of Eircom's network. Eir supports IPv6 if you subscribe to them directly, but their customer service is nonexistent and you'll be waiting over a year just for them to hook you up. For now I stay with the VNO because they have excellent customer service, except for not having an answer for me every time I ask them when they'll support v6.