Mmmm... love everyones comments, and sorry to all for doing 'another tolkien' thread. I am only new 'ere so was not aware that it had been done to death. :S
Tolkien is a hard slog, but then so is Shakespeare (and I still don't completely understand why he was/is so good). The reason why I posted the original thread was to determine how writing styles and popularity had changed with time and I think I have my answer.
If Tolkien came back today, he would have written a masterpiece but with a faster, more compact, more accessible, more digestible format, and I am sure that modern technology (ability to review and re-write so easily) would also have had a great impact.
Tolkien is a hard slog, but it is a memorable slog. You can remember what happens in each book and it leaves behind some definite memories (even if you hate some of the characters). This may be where the Harry Potter series may fall down. I have read most books more than once and even seen the films but for the life of me I cannot remember what happens in each book. They are easily digestable but leave very little behind (except for the adent fans who I am sure know exactly what happened in each book). Where Harry Potter does excell is the 'landscape' is memorable with Quidich, Hogwarts, message owls, flying brooms, wand shops, many flavoured beans and butter beer. It is somewhere you want to be, so people buy it and read it.
I am not sure if you get what I am posting here... but anyway...
Thanks once again for answering my questions (and for a heated debate!)