Price trends are all over the board depending on what the game, location, and condition are.
In general terms:
-very nice or restored older games are still selling for crazy amounts
-crappy condition games are selling for less than they were 6 months ago and sitting much longer
-HUO Sterns have dropped in price with a few exceptions for the hot games
I have definitely seen an overall lack of confidence in buying from those that had a tie to value of games after the MMR announcement. It just seemed to suck some of the zest out of guys that liked pinball but were also building a 'portfolio of games'. They now are a little unsure about their portfolio.
The current trend is also just classic supply/demand and if anything demand has shifted as the large bolus of people that came in the hobby in the past few years have diversified their tastes and are now buying a wider variety of games (both brand new and more oddball or 'less popular') which has relaxed some of the pressure on the top 20-30 list of hot titles. I still am seeing quite a few new people coming into the hobby (both online and local IRL).
Seems to me like the hobby is growing every month but attitudes have shifted slightly (for the better) in the past 6 months and the high profile games have taken the biggest drop in value while many other have even gone up.