Yes, enlargement of the European Union will fit with Common Agricultural Policy, because any nation that joins the EU will have a change to comply with the Common Agricultural Policy. If the European Union determines that the CAP is good policy, there is nothing wrong with wanting new nations to adhere to that policy.
France required Britain's agricultural sector to be a contributor to the Common Agricultural Policy which is part of the EEC budget. Many experts and economists believe that the enlargement will decrease the sustainability of the Common Agricultural Policy. Only a small part of the population and a small part of the gross domestic product come from farms, thus leading many to think costs are excessive.