Another way to understand where this might lead would be to have some of the knowledgeable people make a more detailed proposal as to what they would do if the rules were to open up a bit. Then that could be constructively discussed.

For example, I own a 86 VW with CIS-E. What could be done as an increment up from that would be equivalent to carb rejetting and that kind of thing. Isn't that all we're looking for? A increment of power and $, not a leap to new science.

BTW, OBD-2 is a marker in time that is related to the complexity and level of control you can exert over these systems, but doesn't really establish any ability or lack-off to mod things.