Should be BIG NEWS...
MLB.TV is arguably the #1 streaming company. Industry considers the service and abilities better than Netflix,
Amazon, etc. They are top notch.
Disney has also played with Sony and Sling on streaming only offerings.
I predict that Disney makes the deal and then launches a Disney branded streaming service with all the Disney channels, ESPN, on demand library of movies and TV library. Buys 1 or 2 other channel families and rides off into the sunset driving a final nail into the pay tv coffin.
If Disney could somehow acquire either the rights or buy HGTV / Food and spin up a couple channels with its content, then package up something like Sony VUE where they integrated the on demand services of HBO, SHOWTIME, MLB.TV, etc and sold it for $30-$40 a month with add-ones garnering a 20% subscription premium they would make more money per subscriber, have unique offerings with their movies and shows (kill the vault, some movies free, some .99, new releases $2.99), and actually have growth potential.
It's doable today. Not all that risky. It'd be a good move.