The biggest reason for delay in the US is that the NFL signed a deal with DirecTV that goes from 2014-2022, and they signed it before the size of the streaming market was apparent.
So in baseball, you can get all games streamed for $60 a year. The NBA, you can get all games streamed for $60 a year. But for the NFL, most people can't get all NFL games streamed. You can get a DirecTV subscription, for something like $800 a year, and if you aren't in the DirecTV area you can pay $300 a year to watch NFL games. The cost is just way out of line, because it's priced by the DirecTV people, and their goal is to get you subscribed to DirecTV, not to help you cut the cord.
In a couple years I expect this deal will be renegotiated along lines similar to the other major American sports, and then it will be far easier to cut the cord for sports fans.
You can only do that for MLB, NBA, etc, if you're not in a the local area of the team you want to watch. You get blacked out if you are.
The local sports rights for non-NFL teams are tied up in long, long deals in many markets, and separately for each team. It will take a while to unwind all that.
Correction - MLB.tv is usually $125/year, and it does not include any of your local team's games if you live in the area. If you like following out-of-region teams, it's a great deal. If you want to follow your local team, you have to pony up a similar amount for a separate package that lets you stream local games.
So in baseball, you can get all games streamed for $60 a year. The NBA, you can get all games streamed for $60 a year. But for the NFL, most people can't get all NFL games streamed. You can get a DirecTV subscription, for something like $800 a year, and if you aren't in the DirecTV area you can pay $300 a year to watch NFL games. The cost is just way out of line, because it's priced by the DirecTV people, and their goal is to get you subscribed to DirecTV, not to help you cut the cord.
In a couple years I expect this deal will be renegotiated along lines similar to the other major American sports, and then it will be far easier to cut the cord for sports fans.