Companies can either choose to have their devs take on ops responsibilities or continue having dedicated ops jobs.
In either case, whether or not dedicated ops jobs exist, ops responsibilities always will. I'll be there to pick up the slack because designing and maintaining systems is an interesting job that has to be done that a lot of people can't/won't do and it pays accordingly.
1) Developers don't code on prod
2) Prod needs to be protected
3) Therefore, developers need to be restricted from prod
Source: My employer is currently undergoing SOX compliance