Well, why do you think opening is a good idea, in the first place?
Open Source has nothing to do with code quality - it is just a license, nothing else.
Going open source definitely wont help you to increase your code quality - you need a good team with good skills and good management to accomplish that. You can very easily find several open source pieces of garbage for every shinning gem out there on the dark depths of GitHub.
Unless you are thinking about cooperative effort to build a open-source project, like what is done with several flavors of *nix systems, going open source won't help you at all.
If you are thinking about getting free, cooperative effort from your community, you better have a very good product already. We as developers love to build stuff and to solve problems, but we won't code for anyone for free unless we have a very damn good reason.
Like virtual internet cookie points. We love virtual internet cookie points.
Nevertheless, without knowing why you think going open will help you, we can't give you any answer different from "it won't" with any semblance of accuracy.