And here I was actually hoping for a minor buff with them changing it to 'Chance on Hit' instead of Crit....what a major disappointment. I just bought mine too. With this nerf, I believe the Chance on Hit should be a mandatory change now, instead of wishful thinking.
Chance on Crit already hurts the trinket's uptime, making other trinkets very competitive against it. All the other DMF trinkets are on Hit...