To be honest, I think everyone suffers if this becomes the norm. Regardless of brand size everyone will have to increase their prices.
As I understand it it’s around £700 per item, with another £150 per different size. Smaller brands have less ranges and generally stock fewer sizes. The bigger guys have more ranges and more sizes. Someone like gm for instance would offer maybe a handful of different ranges. Each other those ranges would contain 4-5 different sizes. So their initially outlay would be more. Yes they sell more so the increase in price would be less per model/size but they are likely to have bigger margins so would mark up more.
Smaller brands equal smaller outlay to start with but less sales to split it across so the mark ups would probably be similar.
It’s also likely to remove the new ranges every year from some brand as they won’t want to go ahead with testing every year. Designs will remain the same, be less variety. Factor in the risk of the product failing the tests, retest fees and the costs for retail to stock them it makes for scary reading. Couple in that there could well be an expectation that kit should be changed more regularly to ensure compliance and the consistency of the protection then it’s going to cost lots more. ultimately it’s the consumer that suffers.