Why aren the medieval English Martial Arts of Swordmanship or Quarterstaff fighting practiced anymore?
They are still practiced, but to a much lesser degree and with a much lesser degree of ‘fame’ than the Japanese or Chinese arts. Fencing clubs however are still widespread using European styles of swordsmanship with European blades such as a Rapier. Sword styles using Broadswords or Archers swords for example do exist, such as ARMA, a lot are affiliated with numerous battle reenactment groups but they are Martial Arts clubs and disciplines in there own right.