It was a penalty imposed by the NHL that the NHLPA agreed to have included in the CBA. It's quite confusing that they would do this, but the NHL had an agenda and the NHLPA didn't contest it.
NHLPA has to balance impact to the overall association.
How many of these back diving deals were signed? I will only include deals where the player would turn at least 38 by the end of the contract, thus will leave out Mike Richards 12 year deal he signed after his ELC and Jeff Carter's 10 year deal after his bridge contract. Ovechkin and Backstrom signed deals after their ELC that take them to mid and early 30's respectively.
Going division by division
Pacific - None left
Central - Hossa and Keith (though both appear to be physically capable of playing to the end of their deals. Keith would only be maybe 38 when his deal expires, so the Hawks got a great deal for him)
Parise and Suter with Minnesota (Going to cost the Wild $6 million each in dead cap space if they retire early)
Weber - RFA deal matched from Philly
North - Erhroff - got the compliance buyout so no impact on Buffalo
Franzen and Zetterberg - Franzen on LTIR due to concussions. Zetterberg is definitely slowing down.
Savard - LTIR for Boston, and subsequently traded
Atlantic - B. Richards - compliance buyout from NY Rangers, so no impact to them
Kovalchuk - penalty paid by the Devils, first team to incur the recapture penalties. But, it is a six figure yearly penalty
Luongo - penalty will mostly be born by the Canucks. Panthers will not mind the "dead cap space" charges since their are not a ceiling team.
Pronger/Bryz- Pronger on LTIR and his rights were traded out of Philly. Bryz got the compliance buyout
Crosby - would be a $5 million plus/yr penalty should he retire early
No reason for the PA to argue too hard for maybe 15 players. PA was able to get a compliance buyout clause, so the Rangers, Flyers,and Sabres exercised them and thus avoided the penalties.
Devils eating a small amount.
Time will tell how much impact Chicago, Vancouver, Nashville, Detroit, Pittsburgh will incur when these players retire.
One factor that impacted the salary cap was when teams like Chicago with Huet and the Capitals with Nylander were allowed to bury these players either in Europe. Plus teams did that by sending players to the AHL (Rangers and Redden).
No re-capture on those. Canucks did that too, like with Reinprecht.