Posted By:
Bruce BabcockMy guess is that all the sets you mention will increase in value gradually, with the HOFERs/tough cards in each set appreciating at a faster rate than the others. The number of graded cards is likely to grow which will also push prices up.
These sets are all well known popular sets unlikely to become suddenly "trendy" and spike up dramatically. I don't really see any price decreases as likely given their popularity and the likely continuous increase in the number of vintage collectors with "maturing" tastes. I could not have predicted 25 years ago what I would be buying today.
N172 is such a huge set and has a number of subsets, i.e. HOFers, portraits, Brown's Champions, etc. A couple of collectors with deep pockets who simultaneously develop a lust for graded cards in one of these subsets could cause a dramatic price spike while leaving the price of a "common" unaffected.