Any politician who is pro encryption backdoor is pretty much dead to me because encryption back doors are just a completely brain dead policy that has no merit even if you completely ignore any moral or ethical concerns.
Call me cynical, but unless something removes these people from power, they'll keep trying until people get tired of hearing about it and stop opposing it.
Best things we can do are: keep being loud about it each time, look out for sophisticated attempts to sneak it into law elsewhere, and don't let it distract from a potentially even worse move.