Will made for iPhone hearing aids soon be able to accept direct streaming from Apple TV and or MacBooks, etc?

I don't know the answer, but I stream direct from my TV and computer to my ReSound Enzo 9 3d MFIHAs with a permanently connected Resound TV Unite on the TV , and a ReSound Mini-Mic permanently plugged in to my computer.

I just have to select TV or Mini-Mic on the ReSound app on my watch or phone.

If the capability was going to be built in to the TV or computer we would be limited to choosing Made-For-Apple TVs or PCs, which would probably severely limit choice, but you can use the streaming devices with any TV or PC.

I don't know anything about CostCo.....do they have in house audiologists? I think a key element in buying the right things and getting it all working is a good audiologist. You need one who keeps up to speed with latest developments in iPhone use. Not an old school one who thinks hearing aids are just hearing aids, and does not understand the extra capabilities now possible.

Yes the latest MFI hearing aids and iPhone are the most expensive route. Many of the same capabilities can be done much more cheaply (but less conveniently and automatically) on loop systems.

Some TVs have the option to control the headphone output and TV speakers separately so that it wouldn't cut out the speakers when your device is plugged in. You would have to poke around in your TV settings to find this. If you can't you will have to plug your streamer into the audio out socket at the back of the TV. You would probably need a simple adapter to be able to do this.

Made for iPhone Hearings Aids (MFIHAs) use a 2.4Ghz wireless connection to stream the sound from the TV, MultiMic or MiniMic to your aids, not the induction loop system. You have independent control of the volume of what is being streamed and what is coming into your ears through the hearing aid microphones. So if you want to watch TV and hear people in the same room talking you can do that, or if you want to shut out all background noise you can do that.

With TV it is also important that plugging in the TV Streamer does not turn off the TV speakers if you are watching with other people. You can plug it into the headphone socket if your TV allows independent control of headphone and speakers, or into an audio-out socket if it does not.

The TV Streamer works really well, and the MultiMic has transformed hiking, cycling and driving with my wife. She clips the MultiMic to her collar and I can hear her clearly. We can have a normal conversation in the car, where I choose to reduce the background noise.

I keep a second MiniMic plugged into my computer the whole time, so my computer works like the TV.

Music or phone calls streamed to your aids from your phone work similarly except these use bluetooth instead of 2.4Ghz wireless. Sometimes you want to block out all background noise and sometimes you don't. Making a phone call in a noisy place is where you would block out the background, but in normal phone use I do not to block out the background as it is disconcerting not being able to hear your own voice on a phone call.

The only time I ever use the loop is in theatres or public places where it is very rarely any help. A few churches I have been in have been excellent, but theatres and banks etc not.

Buying my first MFIHAs four years ago transformed life for me, but this whole subject is not simple or cheap, and it doesn't work well for everyone, as these forms testify. There is a lot to learn but it is very well worth while. When I bought my MFIHAs in 2014 I had an iPhone 6 on iOS 9 (think) and the HAs were first generation ReSound Enzo 9. I now have an iPhone X on iOS12 and third generation Enzo 9s and they work much better, but not perfectly. It is still new technology which is improving all the time.