A short historical footnote
It is inescapable that a very large part of the decline of Road Racing entries in general, and likely open wheel in particular, is due to external factors beyond SCCA's control. The great recession swept away a great deal of discretionary spending, for example.
In the early part of this decade, the Club tried to address the declining entry problem. The very first Majors plan (presented at the 2011 Runoffs) shared a fair bit of DNA with the FRP concept. The plan was to reduce the number of Nationals (now called Majors), and to concentrate classes into events (i.e. stage events for a limited number of classes, offering more track time and competition).
The plan might well have worked on the coasts, but the sparse demographics in the middle of the country made the concept uneconomic far large stretches of the Club. What we ended up with was basically a watered-down Majors concept, with Nationals renamed Majors, with every class welcome, and even Regional run groups at some events. Super Tour is kinda-sorta like the original concept, but without the concentration of classes that would have made events more attractive for entrants.
FRP came out with a similar concept - dedicated events - and scooped the table in the East.