No they don't. That's not the coach's job. That's the GENERAL MANAGER'S job, and even he can only afford to plan ahead for the next two or three seasons (which is an eternity in the NFL).
And it doesn't matter how the head coach leaves their franchise for their next job. If they left their franchise well off, it's even more of a testament to how crappy a coach they were with the talent they had on hand. How many jobs did Denny Green get after he build a Super Bowl roster here? Bill Cowher's roster won a Super Bowl two seasons after he left; where did he land on his feet?
The coach gets rewarded with the next program based on what he did with the talent he had on hand in the past, not the future. Even more so, the coach tends to get hired based on his ability to interview and impress his ownership and general manager with managerial competence and plan how to move forward with the pieces that are already in place (it's difficult to get a job when you tell the guys who acquired all your pieces, "Man, all these guys stink. I can't win with this garbage. We're going to start with these four NFL-capable players and fill in around them over five or six years.").