While I agree it is hard to believe, if they lowball him I can see him leaving. Their space is tight next season.
St. Louis Blues - CapFriendly - NHL Salary Caps
And they have to pay Brayden Schenn too. Not that he will command a huge contract but he could have a big season and be around 6-8 million per year easily.
Pietrangelo is probably a bigger priority than Schenn and Bouwmeester... I don't see much of a problem.
If they want to keep Schenn than thats when they make moves... probably involving Allen and/or Steen.