[hackerboos]

If Apple made a retina Macbook Air then nobody would buy the Macbook Pro.

[dagw]

They could differentiate by making the MBP a lot more powerful than the MBA with things like a high end quad core CPU, up to 32 GB of RAM and a fast Nvidia GPU.

Admittedly the market for high end powerful 13" laptops might not be that big.

[hackerboos]

You couldn't fit all of that in a 13" MBP.

[dagw]

Look what they did with the Mac Pro. Squeezing lots of power into small containers is one the things Apple is quite good at.

Lenovo can fit most of that it in their 14" T440. I'm sure if Apple set a team of top engineers on the problem they could find a way to make it work.

[jmnicolas]

I believe that it would be more profitable for a company to offer their best instead of artificially segmenting the market.

[bitL]

Could be. 13" rMBP won't be much different from a 13" rMBA then.