If they lose the attitude that CM Inc. was evil maybe.
I'm watching things closely right now. Their goal is to strip everything not open sourced out of the OS and I have a feeling they are going to run into some trouble with dependencies on CM's Ambient SDK. Nobody wants a phone where the dialer and contacts are tied together and I'm pretty sure CM did that with Ambient. Will be a good test to see how they handle it and what they do to fix things.
As for the trust part, will wait for a few versions and it's all their own stuff and not CM's stuff running before I look too deep.
I think they can do a fine job writing software. The hurdle is going to be in organization and moving out of the hurrdurr Reddit is cool zone. Give them time