Yes, and if you look at teams that continue winning in this league, ei. pats philly, they are not overly loyal to players when it gives them a better chance at winning
Most of the great teams in NFL history have had a core of about a dozen players that you just could not touch without coming in with an absurd offer. The Pats continue that trend although they will cut or trade people for money issues without thinking twice about it if they see an option to do so. So untouchability has to be separated from ruthlessness in the equation. No way the Pats trade Deion Branch for a first rounder last year unless he forced their hand.