It will depend on the manufacturer as to whether they will make the parts specialist or not similar to Apple who train there own independent's to work on there phones, I can see that due to high voltage they may not allow certain parts to be worked on without the proper training and specialist equipment

or will make them non repairable so they have to be recycled one way or the other, I think as regards electronic circuits will become so small they will need thousands of £s to buy the gear to be able to repair circuits if they can be at all such is the component size now

As Messrs Archer, Baker, Carter, Dyer, etc will confirm, as civilisation advances one must adapt and improve or fester and fail. Apart from window cleaning and the priesthood, virtually all jobs have changed hugely over the past fifty years and new occupations have appeared.

Be aware that BMW I 3 experience is that BMW do not repair electric parts: they replace. Which means some repairs will cost £6 to £9k when all that may be needed is a new internal fuse..

This may be true for other makers but BMW electronics are inherently not consistently reliable. Oh and on early 2014-15 cars there are a whole list of quality issues like motor mounts where the design has subsequently changed as they tended to break.

ICE manufacturers played (and some still play) precisely the same tricks over software updates, licensing of component manufacture, replace not repair etc. No surprise that EV are no different.

As already noted - independents will emerge, higher volume spares will be available from other suppliers, copies of manufacturer software will be traded (initially on the black market), supply of s/h parts from written off vehicles will increase.

No different from the rip off trade in ECUs where replacement can cost £1000+ from manufacturer, s/h or repair £100-250.