Can we look at Nasus for a sec?

I'd like to go on record as saying Nasus is one of the worst offenders of just having a fairly loaded kit. Isn't his ridiculously short-single-target Wither cooldown low enough? His movement speed makes him a pain in the ass for not just the target of Wither, but the entire team. I think a lot of his invisible power can be removed just by lowering his base speed (currently tied for second-highest in the game!) so he can stay stuck on his intended target, but not make peeling nearly pointless for the rest of that target's team. I mean, come on, dude has Dead Man's Plate, builds at least 20% CDR almost every game, and usually builds Trinity Force. Obviously Akali/Jax/Hextech Gunblade and Deathfire Grasp/Leblanc are examples of balancing around unbalanced items, but regardless of the items that rack up movement speed for him at this current point in time, Nasus is fast AF. He's gonna catch up to whoever he wants with his Wither and quick feet. Hitting in this area would also probably not tip the balance of his laning too much.

EDIT: Just realized how biased I am when I thought about suggesting Renekton for movement speed buffs immediately after suggesting Nasus movement speed nerfs. Obvious top laner?