Is not too much. As much as i have loved and still love this game for the 6 or so years i have been playing other games out there (Tera, etc..) you get far better rewards for even just playing.
Adding tomes would at the very least keep areas somewhat still occupied? lol. Not saying Shadowbringer areas are completely dead yet however.
Either way the fates need a revamp, i think adding the currency for doing fates that you can purchase items in each area was a good start.