There are not so many stations left on long wave although Russia, North Africa and Mongolia still use it. Ditto to a lesser degree with medium wave as the BBC shuts down many regional station transmitters. It could be simply your aerial is optimised for FM reception and the weaker AM signals if available at all are not heard. If however you hear noise as you tune around on MW and LW there is a good chance your radio itself is working fine.
Most radio concerns are concentrating on digital (DAB) broadcasting and it's been muted more than once that eventually FM domestic services will also close.
