It could fundamentally change. I'll give you one right in particular: the retransmission right. In Canada, there are tens of millions of dollars at stake, and it's the copyright owners of the underlying work who are entitled to this remuneration.
If the directors were named the authors and, therefore, the first owners of copyright, what would happen? Does that suddenly mean that the producers who have raised all this money to produce these shows would ab initio not be entitled to that money? Would it mean that an industry-wide negotiation would have to take place and that effectively, in order to hire a director, they would need to assign all of those economic rights?
This comes back to the comment earlier about a difference between economic rights and moral rights. Certainly in the United States economic rights very clearly flow primarily to the producer and can be shared under negotiated industry-wide agreement. That may be one regime; the moral rights may be a separate one.