I'm not on the fire Monty train just yet but his time to correct course is definitely limited.
If they do change I'd try Gallant or Leach. Gallant always seems to have a pretty short shelf life but his results are solid and I think he'd have a fair chance of getting something out of this group. Knows how to get a team playing solid, hard, fairly straightforward no-nonsense hockey. Worth considering.
Leach obviously we don't know in terms of how he'd go at the top level, but he's earned a solid rep and had some time and experience elsewhere. Bit concerning perhaps that he's already been a part of the Bruins' early woes this season, but it's only been a short time and a partial-season trial may be an ideal opportunity to see what he's really made of.
Depends which way the organization wants to go. Gallant or similar is the safer option that is perhaps more likely to spring a quick turnaround, a Leach may require a bit more patience. What happened last year with the Oilers was exceptional and I don't think should be taken as any sort of example to follow - no knock on Knoblauch, but there's a very good chance their turnaround had very little to do with him and more with a very good roster and its stars finally waking up.