They say that this won't affect any SHA1 certificates signed by a root that has imported and trusted, but there's a lot of devices that ship with their own self-signed certificates installed. I hope all the vendors have away from SHA1 or there might be a lot of "broken" devices.
Remember that if you are trusting the cert itself this is irrelevant because you aren't verifying the chain (which is the part using the SHA1 hash). I presume this is what most embedded devices do. But yes, if you imported a SHA1 root you should probably consider distrusting it.
