Trading Bourque would be a mistake, there are players that get you to the the playoffs and those who help you win them, he's part of the latter, there aren't that many players that can do both, including the high paid ones. Look at Bickell, he's average at best during the regular season, his playoff performances earned him that contract.
Bourque is cheap, he was our best forward against the Sens in the playoffs last year and he's our most productive one this year. Getting rid of him or replacing him shouldn't be one of our main priorities.
I'd also keep Eller and let Pleks go, he's younger and more physical, he actually showed up when it mattered the most unlike Pleks, we shouldn't make the mistake of holding on too long to a player, trade him when he still has a decent value. Time to give more responsibility to both Eller and Galchenyuk, we're packed in the middle, what we need is a solid winger capable of scoring 20+ goals.