As ESPN analyst Andrew Brandt pointed out this week, restricted free agency is a dying classification that appears to have run its course. The NFL's new collective bargaining agreement requires rookies to receive four-year contracts, which eventually will nullify a category that requires an expired contract and three years of accrued experience.
It was a nice run for restricted free agency - NFC North Blog - ESPN

Brandts article

Restricted FA on verge of extinction

NFL - Restricted free agency on verge of extinction - ESPN

Kindof interesting concept. It will be interesting to watch over the next few years.