If that comes to pass I hope that one would be able to install a regular firmware with full DRM support / banking app support which only differs by allowing one to install apps freely. I don't think that's the case currently with firmwares that allow root. The security implications are somewhat different (root is more permissive) but I guess that the kind of person that wants to run arbitrary apps also prefer root access (maybe not at the cost of access to everyday apps with bullshit protections however).