curious question

In like the korean level of play what happens if u just get 3 incredibly aggro pvp lane dominating styles in 1 team vs 3 econ players?

can the 3 econ players use teamwork if all 3 lanes are being pressed like there is no tomorrow?

Well that's a hard question. There are only a few characters who should go econ in KR.
e.g. Zord, B9, PG, ZeDait, Abel, Janne, Fang... probably that's it.
And with such econ you're supposed to either push really hard or support other lanes, esp. mid.
so for example, if you have Janne-Abel-ZeDait in your team and the other team has Mech-Zava-Blade Hunter,
your team is definitely on the risk of being killed on each lane.
For econ heroes you should focus on what your role is rather than trying to do multiple stuff.
Besides, controlling the mid lane is what all 6 players in the game must try to do unless you push your lane asap.