So just blanket "no private communication for anyone"? I mean, why shouldn't people be able to communicate privately? There is no such thing as a "single owner of backdoors", so why try play that game when it never ends with just a single owner?
For instance, law enforcement agencies can receive legal authority to wiretap your phone if they can present reasonable suspicion of criminal activity that must be investigated.
If you want that, you have to also be OK with other parties being able to do so too, as there currently doesn't exists any solutions to that specific problem of just letting one party accessing something without the risk of leaks.