I think people screaming "but Klingons in Starfleet are canon" always forget that Worf was the ONLY Klingon. The exception. Like Neelix was the only Talaxian, Nog the only Ferengi and Data the only android and so on. Its not like any of them started a fashion and their entire kind ran towards the Federation screaming 'yay'. These characters lived from being 'the exception'.
Worf also went back to Quo'Nos with Martok after the Dominion War. Not Martok and his entire family signed up for Starfleet. So I can't really see how the war made it more appealing for Klingons in general to join.