There is a big difference between playing hardball with mid tier players for one year deals who can't get better elsewhere, versus top tier franchise players. Cam is going to get a substantial contract, there's no way around that.
Don't doubt that at all.
But how certain are you that Newton's agent's idea of 'substantial' will match up with Gettleman's? (ditto other popular players)
There may not be that much difference when the time comes, but if there is, how will fans take to the idea of letting a popular player walk because he's asking for too much?
Worth remembering that the Giants have done that more than once.