Reverse engineering is already legal and is very explicitly not a copyright violation - that's why we have open source Unix today. You may be thinking of decompilation, but that can be defeated (at least partly) with various techniques.

Not to mention, with so much software moving to SaaS models, access to even the binaries to be able to do reverse engineer them is going to be extremely hard.

Also, embedded devices using GNU utils and Linux would have no reason to allow any access to the code running on them in a world without copyright.