We're not far off... from where we were in 2007 before KG, RA, James Posey and Eddie House arrived. The 2006-7 C's lost Pierce for about half the year, but with Pierce healthy, I don't see them much differently than I see the 2014-15 C's (sans the future picks). Young Rondo, Perk, Tony Allen, Delonte, Wally, Powe, Big Al, and Scal. Lots of heart and hustle, some good young talent. With Pierce healthy and Brad Stevens, they could have won 35.
So that means that it's possible that DA turns what he has now into a contender ("anything's possible"), but to suggest we really "aren't far off" is not really true.