I don't think this is as big a threat as these comments make it seem. For the tech savvy, setting up a Plex server or whatever can be done in an afternoon's time. The majority of consumers won't go through the "hassle" of setting up their own infrastructure and will make judgement calls on what platforms align with their interests.
I'd bet on Netflix (incumbency), Prime (bundling), Apple (integration with iPhone) and Disney (best back catalog) being the leaders in this space for the next 5 years. Despite major networks getting into the game its hard to see them going all in and cannablizing their TV business just yet
You don't need a dedicate Plex server to pirate. Any bittorrent client will do and people might just be happy using a built in media client. Plus often people are happy to buy systems pre-built (remember the "Kodi Box" craze?). Piracy is a service problem not a price problem so people are willing to pay for systems like this if it's easier than managing subscriptions to multiple services (and the fact it usually works out cheaper to pirate is an added bonus).
I'd bet on Netflix (incumbency), Prime (bundling), Apple (integration with iPhone) and Disney (best back catalog) being the leaders in this space for the next 5 years. Despite major networks getting into the game its hard to see them going all in and cannablizing their TV business just yet