MuscleCar prices rise & fall and rise & fall,just like everything else does in society today.Nothing is immune from this.
If this upsets & disturbs anyone today,then they are in this hobby for the wrong reasons and were in over their heads from the very beginning.
I see only the Carpetbagging chicken littles with no experience,as the first to declare the "Sky is Falling" & jump ship..and I say good ridence to you all.  
 
Speaking soley for myself,if car prices do escalate,I will still own my Super Sport Chevelle.
If car prices do fall,I will still own my Super Sport Chevelle...plus I will buy as many as my 401K allows.
I do believe that if Musclecar prices do fall drastically one day,it'll be the Clones that will take the largest,most dramatic decrease in value first overall the other vehicles on the block at that very time.