The cities of Pilsen and Budweis, not to mention Prague, have been in Bohemia ever since that state came into existence. It has been a state in various European empires, and was in a country called Czechoslovakia when I first visited its breweries. Things have changed since then. I don't think the Bohemians want the Moravians to leave.
Bohemia grows wonderful hops, but Moravia has great barley.
Many Bohemian brewers favour Moravian barley-malt. The Budvar brewery, in Budweis, certainly does. Moravian malt seems to give a particularly oily, soothing, softness to the beer, rendering it deliciously drinkable. This alone is a good reason for Bohemia and Moravia to stay together. Perhaps that is why there is no sign on the freeway from Prague to Brno to tell the traveller at what point he is leaving Bohemia and entering Moravia.