Yeah, making up an artificial an unrealistic definition of the term "urgent" in this context isn't exactly making a point. There's very few things that just "cannot wait" for a bit longer - even your proclaimed Lindholm trade in case the Ducks wouldn't sign him before he became an offer sheet target wasn't that kind of urgent, it appears. If you don't see a whole bunch of teams looking to add a top-4 defender, that's your problem.
The expansion draft can't be ignored while considering Fowler's or any other players trade value.
While there are probably many teams that would like to add a top 4 d-men there is a cost to be considered, that being who can be protected and who would be exposed/lost to LV in the Summer.
A team with a strong top three defencemen under contract for more than two years (or a d-men with a NMC who must be protected lol) might want Fowler but knowing that they will have to expose and probably lose him in the expansion draft won't be offering what Duck's fan consider a fair return.
Teams can't wait indefinitely for Anaheim to get back to them to accept a proposed trade for Fowler.
They will move on to their plan B. Once the number of interested teams gets smaller the return will probably diminish as well this is the urgency.