Suppose that right now I can watch 70-80% of the TV shows I'd like to see by using only Netflix and Amazon Prime (the only two services I actually subscribe to). If that's reduced by moves like this to 20-30%, then the price I need to pay (even disregarding individual services raising their prices) to see the same amount of content is going to shoot up.
Even if all these new streaming services are priced decently, uses will soon have to pay for two or three times as many of them to get the same content. That just seems like a great way to encourage us to stop paying at all, and to go back to either not watching as much, or (for some users, I'm sure) obtaining them illegally. One of the big issues in defeating piracy was that it was sometimes more convenient than obtaining the content legally; this change may resurrect that issue. (I'm not saying it's OK to pirate, but there are a lot of people who don't have a problem doing so; it seems reasonable consequence to infer here.)