Absolutely. A goalie like Markstrom could be the difference between a team like LAK/TOR being knocked out early of going on a Cup run(I don't trust Talbot as a #1), or a team like NJ making the playoffs/some noise in the playoffs.I think a 1st at least for Markstrom alone isn't crazy, the idea that a first for a goalie is outrageous doesn't reflect current supply/demand reality. Especially if you are a contender and that first is going to be after pick 16. If Markstrom were a FA you couldn't get him to sign a 2 year deal after this season either so his contract actually has value in a vacuum. The term matters more so than the AAV.
If Tanev is added it would have to be more than what's being proposed imo.
Edit: I missed that he has a NMC, that depresses the return though.
Playoff teams spend a late 1st on a middle of the lineup depth player all the time. Don't see how getting a legit #1G is somehow a stretch.