No.

This is the first step to production-like irrelevancy.
AKA...keep out the newer cars so that my 30+ year-old car remains competitive.
Also the cars that are being constructed now, are purpose built racing cars. They maybe used streetcars, but they are being constructed with all of the precision and safety of a car that would normally built for a professional series,...
As well they should be. That's the standard towards which we all should aspire.

...
and the current rule wording adds unnecessary costs to be construction and maintainence of said vehicles.
Please provide specific examples.