And whadda you know? You end up with the MBP! All the options so many customers want that the MBA doesn't have. New MBP's are due out soon, and word from Apple is that they will be lighter and thinner. So, there you go. An "MBA" with optional backlit keyboard all yours again--just a little heavier because it has other optional options that other customers complained weren't on the MBA that they wanted as well.
A computer can't have each and every option that you or any other customer think should be there. Decisions have to be made to make the machine tailored to particular customers--that say, "This is what this machine is all about." In this case, the MBA is about being thin and light. Not about having a back-lit keyboard. Some things had to go to make this thin/light machine the best thin/light machine it could be (at a reasonable price), and evidently, the backlit keyboard was one of those things.
There are a ton of "options" out there to give you a lit keyboard from a cheap USB to brightening the screen so you can better see the keyboard, to just practicing finding and hitting those function keys in the dark. That's if you want an MBA now Because tight now it does not have that backlit keyboard. That's all there is to it. Maybe in the future it will return, but it's really silly to complain here about an option it doesn't have which, in the end, can be gotten around if you really, really, really want this particular laptop now rather than waiting for Apple to bring back that backlit keyboard, yet maintain all the REALLY important things the MBA is supposed to have--thinness, lightness, battery-life and reasonable cost.
I know to some that backlit keyboard is the be-all and end-all, but if it really is that, then any computer of a reasonable weight and thinness will do. You really don't need it to be the thinnest and lightest if the backlit keyboard is the most essential and important feature that your laptop absolutely must have or else there is no deal.