How did we manage for decades without dashcams?
Interesting thought about dashcams not being stolen. The advice is often that if it's not bolted down, thieves will nick it: satnavs, aerials, wheels, stereos.
I suppose it's inevitable that we'll all have to have dashcams, eventually; and then I'm sure what will happen is that insurance will refuse to pay out at all without a dashcam. It sends my cynical senses into overdrive that in a way, it gives insurers yet another reason not to pay. So far I'm resisting buying one, because it's yet another expensive gadget we're "told we must have"; and next year they'll tell us that insurers will only pay out if it "meets the prescribed standards", so we'll have to invest in them again. Cynical? Moi?
Let's just refresh our memories of the precautions we've been "told we must take" over the years:
Car stereos. Remember when the advice was to take it with you, or detach the front panel, in case it got stolen? 
Who wants to carry a car stereo round with them? By making the stereo "extractable", talk about making the stereo easier to steal.
Satnavs. Woe betide you if you left it in, or failed to remove the tell-tale circle from the windscreen, which was evidence that you had one in the glove box.
Faraday pouches - car manufacturers messed up badly there, with keyless entry making it easier to steal cars. Who wants to be blamed for their car being stolen because of not using a Faraday pouch?
Also, what happened to the brightly coloured steering wheel locks? They seem to be out of fashion now.
Yes, my views are very highly cynical. But my parents fiercely resisted every kind of car gadget, such as central locking and electric windows, taking the view that it was more that could go wrong.