Just the Middle Class?

In Richey's American Methodism: A Compact History, he describes the founding of the Oxford League as "a youth organization 'modeled' on Wesley's Holy Club."  As one would imagine, part of this club included studying the Bible an building moral character.  The most interesting piece of the goals for the Oxford League I found says "to train middle-class teenagers in the works of 'mercy and help.'"  Now if the UMC looked back to the MEC's youth organizations like the Oxford League and Epworth League, would they look anything like our UMYF programs?

What jumps out at me is the intent to focus on the middle-class teens.  I also do not know the overall demographics of Methodist teens in the nineteenth or twenty-first centuries, so maybe having a focused mission on the middle-class was or could be a good call.  So my question is, why did John Vincent and other leaders of these youth organizations focus only on the middle class?

And finally, if the UMC employed youth organizations also modeled on Wesley's Holy Club and/or the Oxford/Epworth Leagues, how would it affect Church membership, participation, and missions after these teens enter college and eventually the workforce?  Would this help bridge the gap the UMC is facing today in the loss of many young adults in the Church?  How did the MEC's youth organizations affect the life of the Church as their teens became young adults?