I was diagnosed with cardiomyopathy, what is the likelihood that i will have heart failure?

It depends: Why do you have cardiomyopathy? It can be from a diseased heart due to lack of oxygen (blocked arteries), it can happen as a side affects of some drugs, it can happen as the result of some type of infection even a cold type virus. So why it happened, and how severe it is, will help to determine the likelyhood, or unlikelyhood of there being a progression to heart failure.

High probability: This can be kept under controll with medicines and the current treatments that are available see your cardiologist and for further advises.