Only new TV show is not going to save Apple TV. They need to license some old shows and movies too.
...but that's the problem: Amazon/Netflix got started before streaming was big and they could afford to license old content. Now, all of the old studios realise that streaming is big business and are jumping on the bandwagon, starting their own subscription services and clawing back the streaming rights to their old stuff. It would be difficult/expensive for Apple to license a decent range of existing material. On top of that, a lot of the big shows of the past 5 years
are from streaming services. Amazon and Netflix are now mostly focussed on their own shows - their third-party content is going downhill (I believe its worse in the US - most of the new studio-owned streaming services haven't gone international yet, so in the UK Netflix/Amazon still get to run things like ST

iscovery and Picard).
Sadly, the future is probably going to mean goodbye 'pick one or two $10/mo streaming services and get everything' and hello 'half-a-dozen $5/mo services to cover the major producers' - but that's not Apple's doing, and so far it's still better/cheaper to pay for multiple on-demand services than multiple cable/satellite sequential
channels.
Starting a new, original-content, multi-genre streaming service from cold is, er, courageous. It's pretty unsurprising that $5/mo for half-a-dozen shows (of which 2 might interest you) is going to be unappealing. However, Apple can afford to run it as a loss-leader for a few years, relying on offering free subscriptions to hardware buyers to build up viewership, until they've built up a critical mass of original content. Of course, part of the game is that a lot of people just forget to cancel free subscriptions when the trial ends...
I mean, I'm not planning to spend £5/mo for the current offering, but if the free year deal is still going when
Foundation comes out I'll quite likely buy a new Apple TV (although that's also a rather... courageous choice for a TV show and could be awful).
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They’re probably all still reading the books!
Then they're slow readers - Foundation ain't
A Song of Ice and Fire - the original trilogy is only about 600 pages.
The hard bit is gonna be - once they've read the books and realised that 600 pages of rather stilted dialogue in which most of the action happens offscreen and is only superficially described does not make a good long-form TV show - writing a whole new action-adventure story that somehow embraces the concept of the original.
It could still be good - the most successfully filmed SF author is Philip K Dick, possibly
because his stories were so unsuitable for the screen that the screenwriters didn't even try to adapt them and just took inspiration (apart from
A Scanner Darkly).