There is a clear need for an opposite law which will make backdoors illegal. Who could fight for it?
The thing we have to come as a society is willing to accept that sometimes [very big bad] will happen, but a lack of back doors is more important.
Yes, there are insecurities and holes in the above, pending the methods of implementation, but it's one level of potentially many.
And whilst it's good to know that there are technical workarounds such as this, the real work, the real progress for society, is to make these technical workarounds unnecessary by, as the EFF says, contacting your representatives and letting them know what they're constituency thinks. Politics, sickeningly, is the only avenue for worthwhile change.