Today Disney announced their service for $6.99/month. If all of the major services go it alone like Disney that could eliminate the middle man like Sling, DTV Now, Hulu, and YTTV. Then you just buy a box like Roku, Shield, etc., and there you go. Pick your poison.
Most of the middlemen, are the very owners of the channels/studios, that will be launching subscription based and ad supported streaming services. ATT owns DirecTv, and WarnerMedia, which owns HBO, DC Universe, and a few other streaming outlets, will be launching another sometime later this year. Hulu is 60% owned by Disney, 30% Comcast and 10% ATT.
They'll all want to create multiple streamers (as Warners has been doing all along with Disney following suit-ESPN+, Hulu, and the new D+), not just one with everything on it. This won't be as fun as it may seem.