Company secrets shouldn't get any protection at all, maybe other than suing the employee who leaked them for damages. The laws we have today give you the same protection as patents but cheaper, indefinite and without having to disclose anything. That breaks the original tradeoff patents were designed for - legal protection in exchange for making your inventions public.

Your code becoming open source after 10 years should be treated as the cost of doing business, same as a copyright or patent expiring.