Considering DirecTV has been losing $600-800 million a year on it for awhile now and have lost about 8 million subs the last 6 years, not such a good idea.
If someone wanted it to help sell a service, that would be good for ESPN+, but Disney is in a cash crunch right now and spending at least 2 billion for something that might help is a risk right now.
Apple and Amazon are really the only ones that can risk the high costs of NFLST because of how much cash they both have, Amazon has the most chance of selling it as a stand alone service because they have so many Prime members.
How much they charge for it will affect how many subs they get, but as I have pointed out before, if they charge it low, say $100, they would only need 20 million to subscribe to it and break even ( basically), can they get that many, no one knows yet.
If they charge too high, how many can they get.
These numbers also show why DirecTV has not been in the news stories keeping NFLST, if they sell it for $300, that means they need a tad less then 7 million subs to NFLST and break even, well they charge that price now and can only get 2 million subs.