Here's another thought, there isn't a correction for Letang's blunders and the only way to fix them is for Letang to play better. The team just isn't trading Letang, so it's not even really worth discussing.
Just so long as people know what the problem is. If we stick our collective heads in the sand afterward because we understand the team is too committed to Letang to explore the idea, so be it.
Letang is one of about 15 things that swung the series in the Caps favor. At worst I put him tied in 2nd through 4th with Murray and Maatta who both gave away just as many bad goals. And that's assuming you count "depth scoring" as 1 item at the top of the list instead of listing all of Kessel, Brassard, Hagelin, Rust, Sheary, Sheahan, Simon, and Kuhn separately.
I just fundamentally disagree with the premise that Murray and Maatta were as much to blame for this playoff loss as Letang. Their mistakes weren't as frequent, pronounced or indefensible as Letang's were.
In an elimination game where we were up 3-2, he makes a play in the first minute of the 3rd period which directly led to a goal against that was so stupid I'm still having trouble processing it. Where the hell did he think he was going? There's nothing remotely comparable to that play on Murray or Maatta's blooper reel these playoffs. Then as an encore to that shit-show, he just completely ignores Vrana on what should have been a routine 2-on-2 if he simply acknowledged that there was another player in plain sight. Again, neither of these plays have any analog with Murray or Maatta in terms of magnitude or sheer incompetence. And again, it was in the most important game of the year.
Depth scoring was an issue, but the best on that list were clearly dealing with injuries and the worst value-for-money forward remaining is pretty much understood to be heading out this summer. Letang isn't.