Apple will alienate a lot of their customers who like upgrading their computer throughout the life of the product, such as myself. Unless they want to lower the price of upgrading the SSD's of the retina models, they shouldn't discontinue the non-retina MBP.
I used to believe that and was pretty unhappy with the closed system of the MBPr. Then I did some research and less than 1% of laptop owners upgrade. They buy, use, pitch, buy again.
You and I are a minority.
In the end, I came to the conclusion I was just whining about something that didn't really matter.
You can only really upgrade memory and the HD. Well, I do a lot of professional development work so I need pretty high end features. I would have put 16 GB of memory in the machine as soon as I got it anyway. The high speed, low power memory that Apple uses is very good and the price isn't that terrible.
I will never use a HD again, they are just too slow. Again, Apple's 500 SSD wasn't horrible when compared feature to feature with 3rd party. I went with the 500 GB SSD and an external USB 3.0 2 TB WD My Passport.
My MBPr is the best workstation I have ever used. I am thinking about going Haswell and doing the 768 GB SSD or whatever the highest one they offer is. I would like to see something in the 900 GB range but it isn't that important.
Something to think about,
-P