Gandalfs Beard wrote:That doesn't mean he didn't still WANT to do it. It just means he couldn't figure out how to do it at the time.
That seems to me a wholly unwarranted conclusion. Tolkien had no problem ignoring advice and/or criticism when he didn't like it, so his acceptance of advice in this case indicates that he was convinced by it. Additionally, he did
know how to do it and was in the process of it; he just stopped after obtaining feedback. Regardless of what you or other fans want, Tolkien decided against LotRizing The Hobbit. If he had really thought it a good idea he would have gone ahead with it regardless of the advice he had (look at Carpenter's Biography
for some examples of Tolkien's stubbornness; I believe you've read that book).
While it is possible that Tolkien would have changed his mind again if he had lived 30 years longer, I think it is rather arrogant for anyone who is not Tolkien or at least did not know Tolkien personally to make a statement such as that in light of what Tolkien actually did.