Andy Strickland on Sirius/XM Hockey radio this AM indicated that the Blues see Ville Husso as their future net minder and expect him to join the Blues next season, he was the goalie pick for the AHL all rookie team this season. Doubts Hutton will be back and the Jake Allen question still remains. Don't see the Blues as a good partner for Grubauer, however Burakovsky might be a different story. BMAC has a history with Armstrong, so Bura for the Blues '18 2nd and Sanford?
As you say, I don't see the Blues as seriously/aggressively pursuing Grubauer. Certianly not for Jordan Kyrou (lol).
Plan A for the Blues is probably to try to re-sign Hutton to a fair deal. But if Hutts gets more from another team (Detroit?) then I think plan B is probably to sign a veteran backup to a cheap contract (ex. Chad Johnson) and have an open competition for the backup spot in camp between the veteran and Husso.
As far as Burakovsky, I'd imagine the Blues would have some interest, but it's hard to say how much. The fact that Bura is a LHS is not ideal, can he play RW as well? If he can play RW he would be more appealing, but it would still depend on how the organization views guys like Sanford, Foley, Stevens, Fabbri, etc. It would also depend on who they plan on moving this offseason, particularly Berglund and Sobotka.
I would not be interested in Burakovsky at the price of the Blue's 2018 2nd + Sanford. There will likely still be very good players on the board in the mid second round of this draft, and it's likely Winnipeg's 1st will be traded for top 6 help. FWIW management seemed very high on Sanford before his shoulder injury last season.