It depends what it is. A causal bar job, yep probably. A professional highly skilled job, with good opportunities? I doubt people would let a points based system stand in their way.
Those EU migrants that have left so far the UK could have stayed here, provided of course that they had applied succesfully to the EU settlement scheme. Despite this, lots have already left. It would be naive to think that others, especially high-skilled migrants, would actually choose to come to the UK given the additional hurdles they will have to go through now in order to be able to work and live here.