One thing I have noticed is that a lot of new books, in the literary, contemporary, and suspense genres especially, are very short by the standards I read about on word count advice. (Unlike fantasy/sci-fi, which appear to be growing in size, and more like books in the UK in the forties and fifties, where paper rationing was an issue.)
Off the top of my head, I can think of two Booker prize winners who write short, remembering that the Booker panel only awards to what it considers novels, not novellas. Julian Barnes' 'The Sense of an Ending' (2011) is only about 45,00 words. Ian McEwan 'Amsterdam' (1998) less than 50,000, which is a similar amount to his more recent books, 'Saturday', 'On Chesil Beach' etc.
Possibly as a result of the growth in the e-book market, I get the feeling that word count has become less of an issue than it once was.
That said, a 50,000 word Fantasy novel is probably pushing your luck, as is a 120,000 word thriller.