I think that, given that Washington publicly said they expected to win it all the last two years or reevaluate, they wouldn't hang up the phone if a conversation started around either Drouin or Galchenyuk (recent top five overall picks who have shown signs of panning out pretty well in the NHL) and two more first round picks (which Poehling essentially is, and the Caps haven't picked a center that high since... Kuznetsov, so I could see them viewing him as a reasonable trade chip) (he's not a point a game player at any level, and there's some uncertainty with draft picks in college sometimes opting for free agency rather than signing (the Caps got burned once this year) but they've definitely been trying to add players from the USNTDP, and Poehling is on the US U18 team, so, yeah, I could see them being interested).
There's a huge risk in trading a guy who has never scored fewer than 30 goals for a guy who has broken twenty once or twice. But the Caps have two fantastically talented centers in Backstrom and Kuznetsov, and another thirty-goal scoring winger signed long-term in Oshie, so if the return is right, they can take on a potential star and try to help them develop.
I could see a top line of Burakovsky, Kuznetsov and Oshie scoring reliably, while Backstrom mentored an elite goal-scorer on a second line, against teams' second-best defensive units. Without Ovechkin's shot preoccupying opposing forwards, Washington's power play suffers, but they do need to get younger and keep building their scoring depth at even strength, especially after losing Williams and Johansson this summer.
But let's talk about why Jaromir Jagr is on the third line ahead of Tom Wilson, and how MacLellan convinces Ted Leonsis, the owner who was forced to pioneer retained salary to move Jagr's awful contract to New York, to give Jagr anything more than minimum wage, and a line of prospects.
But the idea that Jagr, Doan, and Iginla are all potentially still playing as forty-somethings speaks to the leaps and bounds in sports medicine that have made it possible to stay athletic for a long, long time. Ovechkin is 31, and there's a possiblility that he scores more goals over the rest of his career, than Galchenyuk and Drouin together. Here's a list of 25th overall picks (
http://www.mynhldraft.com/nhl-draft-picks/25th-overall/250509/). A couple did well, but a few never made any impact at all. Patrick White, 25th in 2007, never playd a game in the NHL (
https://www.nhl.com/player/patrick-white-8474158). Quinton Howden has ten goals and seven assists since being picked 25th in 2010. Last season, after Florida did not offer him a contract, he played five games for Winnipeg, and was held scoreless (
https://www.nhl.com/player/quinton-howden-8475769). Mikhail Kuleshov, 25th overall pick in 1999, played three NHL games, registering four shots, and a -1. So I don't see this summer's 25th overall pick being the make or break issue in a trade for arguably the greatest goal scorer of all time (
http://www.tsn.ca/is-ovechkin-the-best-goal-scorer-of-all-time-1.421745). But when teams move on from players, they like to give their fans hope, and 1st round picks are the best currency of hope in sports.
I do think that adding Ovechkin helps the Canadiens win right away. It might also help them win in four years, or in ten. I think they increase their chances of him okaying them as a trade destination if they sign his old friend Alex Semin, again, who is otherwise planning to retire after another decent year in the KHL, and maybe a couple other rising Russian stars to keep him company. I'm just not sure the Caps have given up on the idea of winning a Stanley Cup with Ovechkin still in Washington, yet. He is, after all, their best player every time they win the President's trophy.