No it is not. Karlsson is a goner. This offer gets Ryan's albatross off their neck, and gives them a potential lottery pick back, plus 10, plus they can keep their 4th overall this year without reservations.
4th pick: Zadina
10th pick: Bouchard / Boqvist
2019 1st: Good chance of Jack Hughes, and probably no less than a player of Zadina's level.
You add this young talent to White, Chabot, Brown, etc. and this is the beginning of an excellent rebuild for the Sens. Then, they still get to trade Duchene and Anderson for more prime, young picks / assets. The Sens should just rebuild this for greatness instead of settling for mediocrity.