Some perspective on what moving Duchene and Stone will mean for the Sens in the next 5 years.
Unless they get proven up and coming talent for them, or top 5 draft picks, the chance of replacing these point a game players with other point a game players in the trade bounty is probably 10-15% each. So little hope of replacement of great players there. See Karlsson, Erik...
So after horrible seasons in 2017-18, 2018-19, and 2019-20 with their pick still in hand (hopefully, See Dorion, Pierre, foolishly fleeced), the Sens would likely be bottom 3 in the league, and have say a 20% chance of drafting in each of spots 1-5 in 2020, based on actual finish and luck with the lottery balls. Recent drafts show about 50% of players in the 1-5 slot are very good/excellent, and the higher the pick the better. Stars are good right away, very goods often take a few years to start producing (e.g. Barkov) and many of the 50% who aren't very good/excellent are not really great additions to the roster. Note that more than half of the league's top scorers are top 5 picks.
Assuming four horrible seasons from 2019-20 to 2022-23, the Sens could expect to draft one star, and one very good player out of the 4 drafts. This will effectively replace the Stone and Duchene production, unless one of the players is a defenseman.
In the absence of other picks yielding several very good talents, or existing players emerging as stars, or other moves falling into place, where does this leave the Sens for the 2023-24 season? About where they are now, probably stronger in terms of depth players, but with the same ownership, weakened by better players leaving regularly.
So without a big intervention of fate, (not necessarily referring to a giant heart attack or organ failure...), it appears many years of mediocrity are in the cards, aided and abetted by the dumbest, most intervening owner in sports. Miami Marlins of the north, anyone?