A 12" Apple laptop?
thefrustum.com
thefrustum.com
No customer is going to go for the size of either the 11" or 13" if they can get a better screen at 12" or better screen and more power at 13". I think the weight/size has become so small as to be negligible to most people. I personally have an 11" air and a 12.5" lenovo (of comparable size to a MBPro I suspect) and the difference in size and weight is so minor as to barely be a purchasing decision between the two.
Assuming a next generation 12" retina MBAir would match the weight of the current 11" model, you have a nice even distribution of 1 pound increase per model.
Now, if somebody could explain why they still sell a non-retina version of a 13" macbook, everything I wrote above might be trash.
That's what I have (2010 version) sitting on my desk still (next to my work-owned retina model). Bennies include: 1) super easy to repair 2) Can run 2 2.5" disk - Right now I have a 1TB + 512GB SSD merged with Fusion Drive. 3) It still runs the latest OS 4) Rock solid unibody means it's survived "acts of kid" disasters.
Downsides are obvious (it's nearly 4 yo), but it's cute and the workhorse of our home (along with net-enabled synology).