Warner has never ever re--done an HD transfer - they'll still hawking National Lampoon's Christmas in various fluff packaging for BD that was originally done for an HD DVD 15GB. One Flew over the Cuckoo's Nest is on it's 3rd repackaging, still the original transfer, and they're doing an anniversary packaging for Unforgiven, of course with original transfer done for HD & BD with DD lossey audio.
And while they may re-release LOTR EE individually, they will be premium priced with all the extras. They've only done two releases of EE DVDs - one big box of all 3 like the current BD EE, and then premium packaged & priced DVD releases with all the extras.
I finally bit at the Walmart.com $34.96 price (now dead), under $11 each was my price point, flaws and all. I'll just throw away the 9 DVDs & big box, I already have that from the DVD EEs.