The question of fixing FOTR tint, say in upconverted 3D version with "correct" tint is WB just admitted they have been lying for years about the "blue" tiny is normal. And if WB does also correct the 2D version tint, does WB want to deal with previous owners that already own the movie for years?
But after a few years, WB can also see it as the opportunity to multi-dip by releasing fixed FOTR tint by calling it the enhanced version. WB already improved FOTR from the theater edition and there's no reason why WB can't say they improved or rather correct the tint of FOTR after a few years later. Remember, if there's new profit to be make for multi-dip, the studio usually will do it. I wouldn't be surprised if WB already quietly fixed FOTR tint but refused to release it today as corrected version (It's cheaper for WB to insist the company that did the LOTR extended edition Blu-ray conversion to produce good or correct tint version. Even this is true, WB does not have to sell the corrected tint version today or ever) . Anyone has access to WB's "vault" that keeps different versions of their popular movies?