I love University to the extent that I severely overplay it, but Hanging Gardens would make up for it. Use the Universities for power 5's and the money for Hanging Gardens. Horde becomes another great support card for it. Not only do the Golds help you keep buying Hanging Gardens, they also help make the Hanging Gardens more valuable. But then again, any buy spent on a Horde isn't getting a Hanging Garden.
I wonder if the number of $5's for a VP needs to increase, but playtesting would clear that up quickly. Really, without University support, you probably aren't getting more than one $5 card per turn anyway, since you'll be greening early to pick up your share of Hanging Gardens. But they'll get up to Duchy value pretty quick. Probably surpass it in most games with at least one or two good $5's.
If you find they are too good at 3 per VP, they can either stop counting each other, or bump it up to 4 per VP. Then you might have the sad problem of them being worth less than Duchies though