Everything can get into back line so easily.
Pretty shitty when you play immobile ADC's. 
Pretty shitty when you play immobile ADC's. 
at least ashe has a stun and a slow to peel for herself

You think that would work right?

I'm sure there is plenty of others, but yup.
You shouldn't be picking those champs with a comp that cant peel for you. This is a team game, those backline divers are a hell of a lot less annoying when you have a Tahm, janna, or braum on your team. let alone the rest of your team.
I had Tahm Kench, Vi, Shen, and Leblanc, 3 of those champions can peel. It didn't matter though, because we couldn't see Wukong, and I'd die by the time vision ward was placed.
If the vision ward was placed too late that's a fault of the team not the game design. Ward your flanks, when you see wukong hiding around on the side, make sure you are ready to drop a ward instantly. If hes coming from behind his team notice the difference in pattern from the enemy, if they start randomly charging with 4 you know wukong is coming in so thats when youd drop a vision or someone uses sweeper.