If Boston lands inside of the top 3 and the Lakers somewhere in the 4-6 range I would at least explore the possibility of dealing Rondo to LA in exchange for Nash, who would retire, PLUS whoever LA drafts in the 4-6 range and a future lottery protected #1st rounder.
Ironically enough...because of the picks LA sent to Phoenix in the Nash S/T, I believe LA would first have to actually sign whoever they draft to a contract before being allowed to trade that player. So this would have to be a trade agreed to in principal (like the BK trade) on draft night that wouldn't become official until July.
Scenario looks like this.
Lets say Boston has #3 pick and LA has #5...Boston would draft whoever is left between Parker, Wiggins and Embiid at #3. Then at #5 Boston would have LA draft Exum or Smart.
Exum, Nash and a 2017 lottery protected 1st rounder for Rondo. Nash has already said he would retire. Once he retires there is a chance of that cap money coming off the Celtics books. The league would have to approve. But even if it didn't it's an expiring deal anyway so that money is available after the 2015 season...
Nash I bet would end up signing on with the Clippers later in the season for 1 last run at a ring.
Rondo teams up with Kobe. Melo would probably sign out there as well and they would most likely retain Gasol/Hill on short-term contracts. Lakers would be back in business with a new coach and a core of Rondo/Bryant/Melo/Gasol/Hill
Boston would have 3 rookies coming in (Embiid, Exum, Stauskus?) and I'm fairly certain that in this scenario Ainge would also make at least a couple additional trades ala Bass to a contender for a young player OR late future 1st rounder... Maybe a Green/Bradley S/T for Asik/Lin who both expire after 2015. The goal would be to develop the young players and free up cap space for the summer of 2015/2016.
And with the amount of picks and young talent Boston would have, it would be almost impossible this plan fails. It would take 2-3 years before they are contenders but once they get there, they could be serious contenders for the long haul. especially if Ainge hits on 60-70% of his future picks and/or turns the picks into established talent to push them past the finish line...It's an intriguing option