I don't know of a single dealer that ever hopes the comic market crashes...keep in mind, virtually every dealer purchases inventory at what they hope is their desired profit margin below what they feel is FMV/they can sell for... if a market crashes, it would devalue said inventory to such an extent that probably no amount of books they could buy in the crash, would offset those losses...and, in the case of comics, if we enter into a really bad crash, we probably go the way of the stamp or pulp market and don't ever fully come back...so I have to whole heartedly disagree with that sentiment...
I also don't know of any book collector that cares of about the value of their collection, that wants the market to crash...sure, they might get to buy a desired book cheaper, but same principle, the rest of their collection is likely devalued to the point that it is not a desirable "hope"...
now, bargain only collectors, or collectors that truly don't care about monetary value, might delight in a market crash, but unlikely anyone else would (or should)...
just my 40 years in this hobby opinion, both as a reader/collector and reseller of comics... I truly hope that the market only continues to go up, but my basic understanding of markets and economics preclude me from that kind of hope, given the way our market has exponentially, and many times artificially, increased in value over too short of a period of time (ie "bubble")...
and a comment about "all those millionaires and billionaires"... they've always been part of our market...and for every Ayman Hariri that enters, there's a Marc Lasry that exits...so, I don't think we can look at the outliers as indicators of market strength, as by very definition that data shouldn't be included in assessment of the strength or weakness of a cyclical market...