Yeah, I can't see the "bubble popping". Some serious stuff would have to go down in the world in general. There are more gamers in the world now than ever, more exposure for games (youtube, twitch, etc). There are thousands of DDPs out there and it's one of the best in the genre- is it really just going to stop being worth money overnight? Emulation is great these days, but to some, it's not perfect and can only really get closer than it is but won't be able to be the same as physical goods in hand on actual equipment to some of the people out there.
All of this comes from me- I don't like the prices getting all silly, but I really don't think that everything is just going to tumble to nothing. Still quite a surprise that DDP hit 1k so frequently lately. Makes me wonder why Cave doesn't do more with their IPs if their old stuff is so pricey these days.
Open to counter points though.