From what I read it sounded like he was very likely to be going back to Washington and I somewhat suspect the main reason he hasn't been re-signed already is the expansion draft.
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I've been thinking for a while whether or not Minny would do Dumba for Nurse, I know the Minny board would absolutely hate it, but in the real world I think it has a chance of happening. Boudreau did speak about how he thought it was important to add a more physical element to their backend and wanted a stronger net front clearing presence, Nurse would certainly fit the bill and he is more importantly expansion draft exempt which really helps them. Doing that would skew us to trading Eberle for nothing but futures, but we can possibly rectify that through free agency or supplementing our team by trading off other futures after the expansion draft.
Dumba as a player I've generally not been a huge fan of, he just makes too many stupid decisions, but I will recognize he has more offensive upside than Nurse and being fully honest Nurse himself certainly isn't above making stupid decisions, though I have a greater level of belief that Nurse will work that out of his game. Dumba's shot is something I don't think Nurse can replicate and I will say I wasn't a fan of Justin Schultz when he left, nor was I fan of Leddy when he got traded to NYI, but both found fits with new teams and found ways to either improve the weak points of their game or hide them while accentuating the strong points of their game. I could see Dumba being a good compliment to Sekera, but the thought of him without Sekera seems a bit cringe-worthy as I think he needs some sheltering/hand-holding. Dumba is probably a good bet to be the better player for the next two seasons, after that though is anyones guess and would likely be dependent on how they develop on their new teams.