Normally this time of year this topic comes up, however I believe saturation may soon be a problem, tons of new machines being pumped into to market, with all the new manufacturers it's clear sales are good. People are really maxing out their collections right now.
The day will come when the collector says, "I haven't played these in a few months, I suppose we should sell 1/2 of them". Not quite being ready to let go completely. The hobby remains but and I would expect the "keepers" value to remain strong, but the "okay" titles will bleed as they continue to hit the market. Just my thoughts