This rumor makes very little sense to me.
1. The Blues trade for Schenn, who after years of showing promise that he could step up offensively, finally does so in St Louis to the tune of 70 points after a hot start. People seem to agree that the player has found a good home and the team have found an offensive star who broke out.
2. The Blues have a down year (that's what it seems to be, from my perspective, not a general decline) this year. Most of their big players are still in their mid/late 20s primes, and with Buffalo owning their first rounder this/next year, they arent going to pack things in for a rebuild.
Given those two factors, how is moving Schenn now for future-ish assets, this season, a good idea for the Blues? Unless you see a home run type deal for prospects who are dying to step up (and will very soon match Schenn's production/effectiveness). And those kinds of deals have clearly been rejected. I get that Schenn only has a year left. But, IMO, if both player and team bounce back next year, it would make a whole lot of sense that they want to extend him. Their time to win is clearly now (this disastrous season notwithstanding).
I get that other teams would want to acquire him. I just dont understand how a competitive team where he looks at home would sell him off for anything less than an over-payment. If the Blues cant right the ship, and are still below average next year, then maybe that's the time to auction him off.