Reading some of these responses, I figured I should chime in with my opinion on this whole thing. Again, it's just my opinion so take it for what it is.
I have been lucky enough to own a fair amount of Ducati's, including one of the RS race bikes. I am not really someone to add the latest and newest but I think that I have a good idea when something is special. I have what I consider to be some of the best Ducati Superbikes ever made (yes, there are a couple more that I will hopefully add in time) and my 1199 Superleggera is definitely one of them. It is a very special bike and it's obvious every time I take it out for a ride. It's robust enough to useable but cutting edge enough that you can't help but understand how special it is.
As time goes on I suspect people will start to understand more and more what an incredibly epic bike this is. Over time, the V4's that were unveiled will become just another nice Ducati while bikes like the two Superleggeras will become more and more legendary.
I don't have a crystal ball on where prices will go. However, given the laws of supply and demand, I just don't see where the Superleggera gets much cheaper than they are now (let's say $42k for a well kept 1,000 mile example). They are just way too much bike for the money. If Ducati follows Ferrari's example and puts out a limited lightweight version near the end of the product runs that combine the virtues of the street and race bikes into a raw, aggressive, lightweight street version, I don't see how they don't continue to grow in stature over time and that alone will keep prices from falling much from where they are now.
Just my thoughts but for everyone who keeps saying they will buy one when they get cheap, I don't think that they will ever get cheap.