Re: MacBook getting illuminated keyboard...
iDAG, I really believe that Apple works in a sort of trickle-down manner similar to what is seen in luxury cars like Audi's and BMW's. The higher end products always get the cutting edge technology but as time passes lower end products end up with the same technology trickling down to them.
I'm with DavoMrMac - The MacBook will absolutely get an illuminated keyboard at some point. My opinion is that it's in the near future, possibly even part of the next update. Think about it... it happened with CD burners, then combo drives, then Superdrives.
Regarding the original post, I too would love to illuminate my keyboard but it doesn't seem plausible as akonradi said. The power, control, and lighting would be too much extra stuff for it to be a simple swap. If it was like the iBook's keyboard I would definitely try to swap though!