No you won't as the earlier version of Aperture will not read the later version's Library.
What do you mean by "long run"?
So it seems that in the long run it is better to look out for other solutions than Aperture for the work-flow of my RAW-files.
On your current hardware, a qualified "maybe".
(Just filling out your syllogism. I normally replace my personal computer every 4 years. Because I have been waiting for something very much like the new machines with SSD and retina display, I am likely to sell my current 5,5 MBP (2009) and upgrade a year earlier than I normally do, and so the burden of staying current falls more lightly on me than it might on you.)
Note that Apple hasn't taken anything away from you: you can continue to run your RAW workflow unchanged, and continue to run your RAW workflow as is for as long as you care to define "long run".
Message was edited by: Kirby Krieger