Reading between the lines I sometimes get the impression that some people think the EHIC card negates the need for travel insurance with the EU, Norway, Switzerland and some other counties. It most certainly does not as it only covers emergency treatment although some treatments like dialysis can be pre arranged. If you say need helicoptering off a ski slope or repatriation (alive or dead) to the UK it will not be covered. So you must ensure you have comprehensive travel insurance.
Currently the EHIC scheme will run to the end of December 2020. Beyond that I do not think the signs are promising.