Disney's Kevin Mayer is suggesting that Disney + will be the exclusive home of all Disney content when it is fully established. That appears to answer the question posed about whether Disney would still grant access to their programmes on channels such as Sky.
Interesting also that he is setting his sights on providing a sports option to add to its general entertainment and children's options on its site. No doubt, Disney will be learning from the experience of Eleven Sports in the UK. I see battles with Sky Television looming large here.
http://www.nscreenmedia.com/disney-anchor-tenancy/
“We would like to have an international trilogy of services where it makes sense. We want a sports service like we have here; we want a general entertainment service, which would be Hulu, in different places around the world where we don’t have that; and we want to have Disney around the world.”