It is only a displacement if one assume that the total demand will remain the same, that professionals will be replaced by the cheaper AI while the total volume of work needing to be done remains steady. Take law, there are a great many legal activities that are not done today because of the cost of entry. AI will make lawyers cheaper. That will meant previous tasks that were forgone due to costs will now be financially possible. A small claim that wasn't worth a lawyer's time today will, in a future of cheaper AI-supported lawyers, be financial viable. Complex legal structures like trusts or life estates, once only available to the élite, may now be available to all. The next result may be an actual increase in the demand for lawyers as the total pool of work increases, both AI-possible and that which AI cannot do.

So too for complex accounting/insurance structures.