How about leaving EXO-L alone :) I think Suju is popular in the countries where Kpop is popular, because they are representative for Kpop, first group who spread the Korean wave. During 10 years they build a fanbase.
I don't know if they are popular among the younger generations, if their fanbase is still growing, I'm tempted to believe it doesn't, they have a big stable fanbase, fans who grew with them. EXO fanbase is growing but it will stabilize (cannot continually grow) as new generations appear.