You are exactly right.
LA Times article posted this morning with some insight into the new ESPN streaming service:
The new ESPN over-the-top offering meant to appeal to streaming video users will not be the same channel that cable subscribers currently receive. It will be a separate service available through the ESPN app and offer access to thousands of live events from Major League Baseball, the National Hockey League, Major League Soccer, Grand Slam Tennis, and various college sports organizations.
It will not include NFL or National Basketball Assn. contests that are the big ratings drivers for ESPN’s cable channels, which can only be streamed with a pay-TV subscription. Disney has not said how much the service will cost.
http://www.latimes.com/business/hollywood/la-fi-ct-espn-streaming-20170810-story.html
I highly recommend reading this article. Lot's of interesting numbers in there about ESPN's declining subscribers, cost of contracts with professional sports organizations, and some interesting thoughts about Google and Amazon getting involved.