I paid ~$280 for each U6 Enterprise and that's the only thing that limits how many I have. I'm sure it's the same for anyone that cares about wifi performance. How much of a premium would you pay for better aesthetics?

I'm not saying there aren't advantages to this idea. Eg powering the APs with 120V from the light fixture would mean they can use fiber instead of PoE 2.5G ethernet. That would save me the cost of an extra switch and also reduce power consumption on both sides of the cable. But I'm sure a combined light+AP unit would be expensive enough to make that a moot point. If anything, I'd prefer to sacrifice even more aesthetics and use a bare PCB to save money if I could.