Even if the streaming is free, it isn't a good change. There are football fans that may have poor internet, no internet, etc, that use satellite tv and pay for Sunday Ticket. There are bars that pay big money for it - and yes - some bars have customers at 9am (third shift factory areas for example).
To make it an "event" the stream will likely be free, but there is no reason they couldn't still give DirecTV airing rights for their big programming commitment.
I dropped Sunday Ticket last year as it continues to be less meaningful with the amount of free games - especially with getting two extra DMAs via antenna that often gets me a couple extra games too, as many weeks West Michigan has different games than East Michigan, with the exception of the Lions. Add the increased Thursday games, international games, etc, and i dropped it.
A side note - the Bills will be a much improved team this year and could contend for their division, along with Miami. It won't be an easy ride for the Pats anymore.