People really, really, really don't want to jg
I've been playing a decent bit of normal games lately, and I used to queue for either sup/mid or mid/sup. Whenever I queued for mid/sup I got mid unless the queues were really long. I got fed up with support though, since it's not fun playing with a teleport adc into a kill lane, so I decided to try jungle as my secondary. I've been getting instant queue pops---- and getting jungle pretty much every single game. I have to queue for something else secondary if I want to have a chance at playing my primary.
Maybe riot needs to look into the role? Repeated xp nerfs only exacerbated the issue they were trying to fix- spam ganking is still far more rewarding then farming and intelligent pathing.