I'd definitely do it. Varlamov has suffered this season from backstopping a struggling team, but with Landeskog and O'Reilly back in the lineup I think the Avalanche will improve down the stretch. Even if Markstrom plays well, Florida is not a very good team. At worst, I think the goalies will have similar results.
Oh, and after Markstrom's yanking last night after giving up two goals on two shots -- I'd accept quickly before the offer gets pulled!