I think that netflix will be the most likley to survive this streaming wars even though their product has been an obvious decline to try and keep up and generate their own IP as other production houses want more money to stream their content. I can't be sure but the other 5 don't seem like they will survive.
Perhaps apple will keep theres going even if its a loss the same with amazon, the only real competitor I think is Disnely+ with Hulu
Apple has a good start. They used to offer one year free service if you purchased new Apple TV or other Apple device. They might still be doing that. Even though their selection is not huge, they do have really decent series. They subscription is not that expensive too, I think $6 a month. If they continue focusing on quality, they may do well in this space too. Especially with the userbase the have built already, why not?