[jpk]

That's literally what the author of the article describes.

From a practical point of view I think it's silly to do such a thing for a residential situation, but I can appreciate using it as a learning experience for building systems like this.

[isostatic]

Depends how reliable your isp is ans how much it costs if it goes down.

3g is good enough backup for me, but for the office we go for two routers two isps and vrrp on the lan side, load balance across the wans, with failover to the other one.