Some of the cousins would have though it ridiculous that the families were still feuding, but yes, I think parts of the families would still have been enemies, and I think it would come up in backhanded ways if they tried to hide it. Romeo and Juliet would have had to leave Verona and move to another city, but then they would not have had the wealth of their families and eventually it would have weighed on the couple causing conflict. We should write a play about it. Have the two wake up, it was not real poison, but just a drug that slows their hearts and breathing temporarily.