There has been so much back and forth, chopping and changing etc of doctrines and prophecy over recent years that I suspect many would comply with any radical or strange requirement.
Hardcore ones often remain' locked in' because they have 'invested' heavily over the years, and risk losing much if they 'withdraw' their investments. . Just as with utility companies where many stay loyal to expensive providers, such hardcore ones are unwilling or unable to look beyond their 'present religious provider'..!