It was long thought that porn was immune from economic down-turns, but that was based on wishful thinking, not proven reality. Few of us alive today have actually experienced the porn world in a bad, really bad, economy. But that may be changing:
Financial Woes Hit Gay Adult : The Adams Report by JC Adams
Of course the truly interesting porn seems to be made more by amateur outfits and not the big porn houses who were hanging on the edge even before the economy hit on a tailspin. I suspect amateurs and pro-amateurs will do just fine since they have far lower costs of operations, but some big names we all know in this industry may very well disappear soon.