I guess my concern about bus stops isn't just about not having timetables, it's that services of some operators aren't mentioned at all. Certainly in Derbyshire there are stops you would only think a Wellglade company served and not be aware that Hulleys also ran from there.
I think to your list I'd add a simple network map plus 'nearby stops' information. The former helps you get a feel of 'what goes where' and the latter because in some cases you might end up at a stop with only one service, but a 10 minute walk might get you to a one with much better provision.
Whether they'd work with the typical UK attitude to public property, but in many European countries I've seen e-ink type displays which almost replace a timetable case and show some info on the next bus and service pattern.
I'd also like to think in more rural areas where a cellular signal might be less reliable that bus stops could have WiFi fitted so people at least have a means of checking timetables and live bus tracking. As an aside, I noticed the stops in Paris all have USB charging points, something which would also be useful I feel.
(And yes, I fully expect the 'who pays' comments - I'm hoping priorities might improve under the next administration)
I'm only guessing, but Derbyshire may well require a written agreement from an operator before they can put up their own displays and bus stop flags. It would give conditions and obligations e.g. what is acceptable to display; how long is to be allowed for an out-of-date display to be removed; methods of working; how to share a case if there is more than one operator; and so on. It may even require a payment to ensure that the authority can remove material if the operator was to go bust (this is a standard condition on brown tourist signs round here, for example). Unsurprisingly, smaller operators usually find it more difficult to comply with these requirements than do larger companies.
At one local authority I work with, it has basically ended up being the large operator does its own, and the authority does the rest, although this is aided by the fact that there are almost no commercial services run by the small operators, so the split is pretty much large operator commercial/small operator tendered.
The budget copes with this, and the Enhanced Partnership makes provision to charge an operator for commercial services if they don't produce their own (I think Transport for West Midlands charges everyone, there will be other examples that are permissible under Transport Act legislation).
But the last price I saw for an e-ink display was around £8000, which buys an awful lot of paper publicity.
I've got a sort of vision for a basic bus stop / shelter that could be one or two perching seats with a simple wrap around side and stop. Enough to keep the worst of the weather off. Built in cases for timetables and maps, solar panel, light and charger. Some form of connectivity to show departures on a built in display. Something fairly cheap to manufacture and which doesn't need any infrastructure to install. Ideal for remote locations as well as quieter suburbs and the like.
If it's got a light and charger, it needs power, which means solar panels and batteries if not connected to the mains. And as new provision, it would have to meet in full all requirements for disabled access, so it almost certainly won't be small, simple or cheap. For example, step-free access for a modular unit either requires the site to be excavated (so a shelter can be dropped into it with its floor level with the pavement), or a ramp provided, which potentially has negative impacts on pavement widths, may interfere with utilities and so on.
I'm sorry this all sounds rather negative. Fundamentally I agree with most of what you are proposing, but from many years of experience, I know exactly how difficult and costly it all is to achieve.