My first reaction is that I don't think I could
cope with more!
However, I do think that unless Tolkien himself had written some more tales, then it's just something we will never be able to grasp. He always wrote
just enough tales. Perhaps it is familiarity which makes me feel comfortable with what there already is. And I bet that explanation was like talking in circles a bit?
Besides, there is so much other stuff available, and the more you read it, the more you realise how it can be read in different ways; the level of detail I'm sure is one of the most important things for keeping the Tolkienist hooked. Everyone here seems to have their own 'area of interest', for example we have those into learning the Elven languages, people interested in delving in HoME, those who like to create their own tales leading off from what Tolkien wrote.
I completely agree about those spin-off books though. I had the pleasure of sitting back and watching the almighty row of two Star Wars fans a few weeks ago while they argued about whether the spin-offs were 'trash'. I think that's what you get when the film comes first. Thankfully, it's al the other way about with Tolkien!