There is more to the ESPN business model which makes it very hard for ESPN to change to an over the top model. ESPN derives ~75% of revenues from cable subscriptions and ~25% from advertising. This was a good mix for economic downturns, but it is not a good mix for a streaming model. In contrast, HGTV is ~30% cable subscription fees and 70% advertising, although more economically sensitive, it means moving to a streaming model is more important and easier for HGTV to follow their audience to drive ad revenue. Also, ESPN's CPMs are close to 50% higher than the next higher cable net. Sure, ESPN has an attractive advertising audience, but that is a huge gap as they have really pressed ad pricing over the years.
It's all academic and we will be able to revisit this thread in a few years to see how the businesses are evolving and performing performing.
If anyone is interested, this is a very in-depth study of the cable tv market done by SNLKagen.
https://ofccolo.snl.com/Cache/CBC3AA560637320340.PDF?Y=&CachePath=\\dmzdoc2\webcache$\&O=PDF&D=&T=&reqFrom=SNL3