Zhonya's Hourglass Fix?

We've all been there, a fiddlesticks most prized item, and it grants you a kill all the time if you use this nifty little item with his ult. Every time I face a fiddlesticks, they do this all the time.

So I suggest a fix to the hourglass itself. What if the hourglass makes it so that everything the character has or does is nulled on the character using it for the duration? Doesn't feel right when debuffs & dps gets nulled just fine while their skills are still in motion. To me, it feels like this will balance out some things that champions can do to abuse the hourglass.

But what are everyone's thought on this as well?