None of you answered my question, or if you did I didn't understand the answer. Perhaps my question wasn't well put.
Why is Disney putting together a group of people - devoting time and money - to decide what is canon and what isn't?
It is perfectly fine to defend an IP without any canon at all. GW does it all the time.
No one would try to market anything with anything from GW's IP though outside of the genre. President Reagan sold missile defense calling it Star Wars. Slight difference in the breadth and value of the two IPs.