The way I see it the following are locks for the EC Playoffs:
CLE
IND
ATL
CHI
CHA
WAS
That's it. Six teams. Can't put BKN there until Paul Pierce makes a decision. Won't put NYK in there until Carmelo chooses. Three of those teams (ATL, WAS, and CHA) should make good strides in '14-'15 and make for a much more entertaining playoff series than this past year.
So I wouldn't say BOS is a lock for the 8th seed, let alone 7th or 6th. Really depends if that's what the organization wants and if it is, they'll make one or two more moves. Honestly it may be a battle for that 8th seed this year. Wouldn't mind seeing that happen though.