Veigar Ult Change

What if, instead of having all of the damage up front, what if his R lost some damage and instead did the same damage IF his target were within his E walls? Like, what if his E collapsed / imploded if Veigar used R on someone inside of it? Be it stunned from the walls or just stuck in there.

This could add a cool element of counterplay AND more damage for Veigar if multiple enemies were trapped inside. Only one would take the R damage, but everyone else could take the make-up damage from the W collapse. It could be super cool.

EDIT: To anyone saying Veigar already has counterplay and/or is weak, I think his ult is pretty much the reason why. I think it holds him back because it is a point and click nuke. With a change like this, I think more power could be budgeted towards his other skills, be it some range or something else. I personally think the R lacks counterplay and takes up ~35% of his budget, with ~45% of it going to his E which is more or less fine.