Why not? Pretty much everyone that needs a redundant internet connection (dual ISP) does it.
It seems silly to me that an end user company not providing any network services which only has a 256 IP block has the ability to break a significant portion of the internet with a configuration mistake. There are several ways to setup dual ISPs and routing that don't involve such risk.
thisissue still exists if you break up your IP space, it just makes it far harder to manage.