Oh to dream...
Yes, all this is possible but not today, and mostly because of the way the cams are designed and made. The SOC approach is probably enough to make a really good 4K cam with no features but that's about the limit today. What we need is something more like a PC where you have a board for video, another for audio, and so on which then go through a main processor to compile it all into one end product. But that takes space, and you've also got heat which has to be dealt with. And if you're using a parking mode it takes more power to do this. Remote cams are the way forward here but that only addresses the size issue and to a lesser degree the heat issue. And of course the more you put into a cam the more it costs. So to do something "ideal" today would take a 'main' unit the size of a small book with active cooling and a separate battery of a high amperage for just the cam. And deep pockets too, because such a system would cost at or upwards of $1K US
So maybe someday, when we get super-efficient processors which are more heat tolerant or someone starts building cams taking the 'PC approach' we might get all this but it isn't anywhere in the prospects which the near-future sees, and not even when you look as far ahead as you can into probabilities
And if such as this ever does get done it is most likely to be something made integral to the cars themselves, sort of how Tesla cams function, which isn't really a "dashcam" anymore.
And this doesn't even get into the related issue of 'wireless' connectivity for remote viewing and saving to cloud. As we over-use wireless where we shouldn't, the available network space for everything gets reduced and costs more. There's only so much radio spectrum available- we cannot make more. So yes, let's dream but let's also be realistic and understand that we can't have what we dream of, and by the time it becomes possible an entirely different approach will be taken. IMHO we're in "the golden age" of dashcams right now and the future is bright but not long-lived because in another 20 years every car built will already have it's own dashcam system with few if any options given to us, which is good for the people overall but not so good for the cam manufacturers who will either have to change over to building the systems for car manufacturers instead of us, or find another business field to venture into.
Whatever else may happen, the only certainty us that the future will be different from today in ways we can't yet see, driven there by the dreams of today
Phil