The reason why the queues are long is simply one: since weaker people that never reached sage of six paths once don't get their negative points resetted and every time they go in just meet monsters and get their negative streak increased they give up and never click on ranked again. Until oasis don't understand that they have to remove negative points for people that never reached sage of six paths you'll experience these queue because none joins it knowing that 99/100 they'll lose and that their negative points won't get reset at the end of the month.