Nope, they should not be allowed. It's enough what happens at the club level. National team should be nation's pride and strength, not some money-making advertising machine.
The teams that hire foreign coaches and managers are prideless, have low self-esteem and they admit they don't know shit about football and need foreigners to teach them. They shouldn't be allowed to compete among the proud nations. They should have a special tournament called The Chicken Nations World Cup.
