The board knew that the "5 year plan" idea with Deschamps coaching was not going to be feasible. They have to get it right in two years, top four next year and CL the next season. Without these results (or potential this summer) it's bye bye Buffon, Trez, Camo etc and with it bye bye club identity. For a business as well as a team this would be suicide and DD simply didn't seem to have their full backing despite the (only very recent) press to the contrary.
Most of us complained about the quality of Juve's play this season: Boumsong, where were Bojinov or Giovinco, throwing away leads, early Coppa exit. The board saw this too and clearly feel that the positives from this season were more down to the character of the players than the coach's quality.
DD has been courting other options all season. He has not had his eyes shut to what was going on. Yes, he is Juventino and yes he came when the deduction was crippling but he never expected the deduction to stick - possibly not even the demotion (which he acknowledged in the press). Plus it's not like other clubs were clamouring for him at the time; Lyon could have gone for him then instead of Houillier..
So while this episode does leave a bad taste in the mouth it is perhaps the best decision for all concerned. If Juve have been professional and even a bit callous is it any worse than when we sold Baggio or Zizou - and moved onto better things as a result? This instinct is inherent in the Juve DNA , and maybe necessary for the first year back with the sharks in Serie A.