How fun would it be if Poppy's ultimate also did damage upon landing?
Maybe make her ult deal damage in 2 portions - initial damage and upon landing (tweak the numbers so it would be balanced). Imagine the satisfaction of getting a fadeaway kill or the horror of being in the air with no hp.
http://1.bp.blogspot.com/-g0qmgEgLG3w/VlUhH55NZqI/AAAAAAAA1Vs/sAIrxvhhAqQ/s1600/pr2.jpg