Will Apple ever make just one Macbook?

I've been thinking a lot about this question today... Also let me add this this is maybe 5-10 years down the line.

What if Apple made just one Macbook? It would have the body of an air, but the power of a pro. They could make 11", 13", and 15" models, with retina displays.

They would be extremely customizable. you could get dual or quad core CPU's, a graphics card, etc. Because there is just one line they would need to have a lot more flexibility. By that time SSD's should be a standard.

Obviously, In 5 years the cost of retina displays, and SSD's should be a lot lower.

To me, having just one laptop line seems very Appleesque.