I would imagine that there are more youth performing now in DCA, Soundsport, WGI Guard, WGI Percussion, WGI Winds, DCI Open Class, on a total collective numbers basis, than are now performing in DCI World Class units.
The Spartans ( Nashua, N.H. ) also seem to me to have developed a model for a Drum & Bugle Corps that works perfectly fine for them, and in keeping with their Mission Statement's Goals and Objectives since 1955 as near as I can tell too. The DCI Open Class Champion for 2019 stays within their means each and every season serving youth. As such, they have served far more youth in numbers over the years there than the dozens of former DCI World Class Division Corps that no longer serve any youth at all anymore.