819!? 819 is not a lot of movies. Some folks over on Criticker [1] have thousands of reviews. Think 15,000. I myself have reviewed 440, and I've never seen a lot of well-known movies. To say "no more" after 819 just seems odd. Perhaps one needs a break.
I do agree that miniseries have grown as a genre, but I wouldn't be confident in saying it caused movies to decline.