I'm sure that's true. Of course, the ones that are currently available (and like I have) were not available as early as you have been talking about, since that was decades before anyone had even dreamed of BS1362 fuses!Oh sure, but I would have thought not as commonly used as when mine were put in (c. 1934).
That's obviously true, but individual experiences vary. For example, my current mobile phone and tablet are the first I've had which have used USB charging (rather than a wallwart).Certainly more recent than mid 90s but I'm not sure I'd say appreciably more recent. USB has always had power as well as data and before devices used proper (i.e. standards compliant) USB connections, many manufactures used USB-type cables to connect & power their devices but with software on the computer (or a dedicated wall-wart) so you had to buy a proprietary product.
It would be nice to think so, but manufacturers of mass-market products have the ability (which they sometimes exercise) to effectively 'force' changes on consumers/users, even if the existence of a 'clear advantage' (other than to those selling the 'new technology) is debatable! Maybe 'non-contact' (no connectors at all) charging will start showing its face?No real idea. USB will still be common, as you said, for at least a decade. If something clearly better comes along then it drop back reasonably quickly on new devices. However it is being updated (for data and for power) so anything that replaces it will need to have a clear advantage to make a change worthwhile.
Kind Regards, John