This team as constructed is not tough enough for the playoffs, they also currently employ Matt Grzelcyk and if you are planning on making a deep playoff run he should not be on the team. I do not expect Sweeney to add a number 1 center or top 4 D but he can add a physical D to replace Grzelcyk and a physical, big bottom six forward who can replace Boqvist or Steen.
Standing pat will not make them a contender as Florida, Philadelphia and Carolina would be terrible playoff match ups. All much to physical for the Bruins, beating those teams in December is a lot different than beating them in April or May.
I am hoping for tweaks to the line up to make them more playoff ready, IE tougher to play against.