I absolutely love Fitness+.
It's an excellent service, well worth paying for.
I'd be extremely disappointed if it ceases to exist, or undergoes extensive changes.
If you look beyond the admittedly US-style of presentation, you do see trainers who are focussed on the right thing – which is all around wellbeing (including mental health) and the health benefits exercise brings. In other words, if you drop your resistance to their strong enthusiasm a little, the whole process of working out can become very positively reinforcing.
I love that there's no sense of exclusion, quite the opposite – all of the trainers feel so welcoming and encouraging. And I feel like I belong as a user, instead of 'being' in a place that's not for me (which I'd likely feel at many gyms).
I loved the point another poster made about it working well for them as they live in a rural area – and to add to that this service is great for being able to work out exactly when it suits you. I've done many a workout very late in the evening, middle of the day, early morning etc. fitting around other family member's use of the living room. The tvOS integration is fantastic, as is the connection with Apple Watch.
Apple should definitely promote the service more on its own, and do so regularly (a high profile but brief marking campaign would likely not help improve use – or sustained use – of the service). Perhaps a tiered pricing structure might help, as customers would feel like they had some choice or control over spend. And expand it to anywhere that is happy to use in English initially, building out with other languages later.
I think everyone who loves the service, doesn't want to see it disappear, or has posted here saying they feel sad about the idea of it being closed down, should email Tim Cook with their comments (and perhaps any constructive feedback), as well as use apple.com/feedback. Maybe even throw in a link to this thread – there's no guarantee Apple, or the right people at Apple, are even aware of this discussion.
This is one rumour I hope is flat out wrong.