Right now they just breeze through them to hit level spikes and then gank constantly.
Would give more choices as to what to do in jungle, rather than just
red/blue->crab/other buff/gank->crab/gank->gank->gank some more.
Would make counterjungling more risky/have more counterplay too. Lee Sin and Kayn can basically do a Houdini magic trick on enemy red buffs and then magically disappear themselves. They are physical damage champions and do not do magic damage; in no way are they magicians.
1.) could red/blue have significantly more health in particular
2.) could most jungle creeps have a bit more health and damage, and offer a bit more gold/exp as well so they don't feel so blah for killing
3.) could jungle creeps' scaling get nerfed to compensate so that they aren't that relatively strong the whole game.