The way I see it is this -
At some point all of the special tools needed for unique tasks on these engines will be unavailable from any manufacturer. Whether it be a year from now or ten years from now, OTC will flat out tell you "NOT AVAILABLE" when you call them to order that part number. In my line of work (vintage industrial control systems) I deal with this every day, I can call GE for a Genius handheld programmer and get laughs since most of their sales people haven't even seen one...
We as a collective group have to "get creative" so to speak, when it comes to keeping these special tools available. As mentioned previously, Jason builds a IP wrench of equal or greater quality than the OTC tool, he offers it at a lower price, and it doesn't take him six weeks to get it out the door and delivered to your doorstep.
Any tool is just raw material machined or manufactured to specific tolerances. The OTC freeze plug installer doesn't have some sort of black magic inside it I suspect. Knuckledragger took the time to measure all of these tolerances and provide those dimensions to us. There are a whole bunch of tools that I would love to get my hands on (specifically those lovely red Rotunda Ford IDI tool kits) but I am stuck waiting and wishing that a decent one comes by on Ebay.
I've only been waiting three years or so to get one...