In a post about Nasus and how viable he really is, Morello commented on his thoughts on the scaling abilities of Veigar and Nasus and how it effects them. It would seem the winds of change will soon be stirring for these champions with "farmable" power.
Relating to champions like Garen, who have a cap on the bonus stats they receive from abilities, I don't for see this ruining the champions, but perhaps just a way to balance them a bit better.
- Morello, Lead Champion Designer, via the official forums.
"Agreed. We're working on him pretty soon, we're evaluating cool ways to do those Nasus/Veigar farm skills and make the character consistent.
That mechanic has to go, at least in its uncapped state; it makes characters unbalancable and too many best case/worst case differences."