I'm not really sure what you all are on about, there's PLENTY of new enema and medfet videos and studios. The old standbys are still around (Gyno-X, Enemarotica, Rectal-temp.com) but there's also newer studios like Water & Power, EverythingButt putting out decent BDSM/hardcore videos, and studios like Enema Brats, Captive Clinic, GYNclub, and Private Patient who are putting out imo great enema/medfet content. Not to mention all the Japanese studios who go the extra mile to test how extreme or convoluted a fetish can become, some of which are even starting to learn that the squealing girls can be a major turn off haha.
Stonefox is the only studio I know of that's stopped producing recently (correct me if i'm wrong here), and they aren't even that much of loss since they really ended up just producing the same video over and over with the same actors just changing roles between them.
As far as finding stuff goes, half of it is just knowing where to look, but the other half is that most of these newer sites are keeping a lockdown on their videos. If a video gets uploaded to a filesharing service its gonna get removed before anyone can get the download with the typical free speed limitations such sites utilize. This combined with most ISPs watching torrent sites like hawks and sending C&D emails to users caught connecting to them via torrent clients means the era of "free fresh fetish porn" especially in terms of full-length videos is slowly coming to an end.
I'm doing my part to keep it somewhat alive but I make sure the videos I upload are from dead studios or at least studios who don't seem to mind when their stuff is shared. The minute I get a video taken down for copyright claims I move all the rest of the videos I have from that studio into the "do not upload" category because I don't want this fetish scene to die out completely due to the small efforts of a merry band of internet pirates.
Also please don't give me that whole "its impossible to catch EVERYTHING" excuse, you're right, but as long as you do your due diligence and monitor the popular places where links are posted to pirated material then all will be well and your content WILL stay locked down. Case in point: I have no videos from Private patient or Enema Brats that I didn't pay for. Not due to me being unwilling to pirate them if I could, but out of the desire to view the videos and the reality of popular filesharing sites having NOTHING from those studios online for more than a couple hours at a time.