Rozier is worth the gamble. If it works, they could win and not lose fans (something a team in Charlotte desperately needs), if it doesn't they'd get a PG next draft that they can pair with Monk, Bacon, Bridges, and Washington.
Kemba was 24 years old when he shot 28% from the field and 30% from three. I'm not saying Rozier would be the same, but I get where the Hornets are getting their trust in Rozier from.