I am both a b1 and b2 licence holder and I have done the crs courses for both licences on 3 types but at the moment I only use my b2 because there is no extra money from my company to use both until this changes I will stick with the avionics.As long is there is wiring diagrams to be read and wiring to be done there will remain a need for b2 licence holders and you only have to look at the contracts out there at the moment that companys pay more for a b2 holder than a b1.In my opinion we should of stuck with the bcar system.