If you want a 'real' 'free market' in pilot labour, you would have to abolish all work visas and you would have to have one global license accepted by all nations. Which now means you are competing with people who will be more than happy to move here with their extended family from all corners of the globe.
But I don't think you are interested in competing in that sort of free market you just want to abolish seniority and cut the grass of the FOs.