There are basically three groups of viewer:
The book-first set, by tendency older on average (it
has been 18 years since "Fellowship" premiered), including the hard-core book nerds, many critical of PJ.
The film-first set who felt motivated by the films to go take a look at the book sources, with varying results; some may have also become book nerds.
The film-only set, whose only "knowledge" of "book-canon" is derived by the harangues of the book nerds on sites like this, perhaps also in print and TV.
I see no reason why the third set, at the very least, might be eagerly anticipating the Amazon series.
As I mentioned elsewhere, there are aspects of the six films over both
books in which PJ and the entire crew did an amazing job (some CGI from LoTR might look a bit dated by now). So the template against which the Amazon series will be measured by the film-only set is PJ's double trilogy.
As I posted above (oh - on Christmas Eve my time - and very early in the morning ...) that could be a tall order for Amazon ...