Okay lets be honest here, everyone buys iPhone's and iPad's that you can't really change in anyway except maybe a battery here and a screen there. I don't really see people complaining about upgrading the CPU, ram, graphics, storage, etc... I think we have just gotten so used to being able to have the option to change our computers at will, we don't want to think what its like without that option.
Now I love being able tinker with my computer if I think my HD is slow or I don't have enough ram. Heck back in the day I wish I could of upgraded my 12 inch Powerbooks crappy graphics card, but I couldn't

. So instead I sold it and bought a newer Macbook Pro Unibody. But I didn't really complain about that because laptops don't really have graphics card updates, it was something I accepted.
Who knows, maybe once this becomes more common there will be more alternatives to expansion. But until then Apple hasn't discontinued anything yet, only gave us another choice when buying computers

Fingers crossed.