I understand your concerns with Unity's history, but I remain confident that Unity is the right tool for Sound Show. The choice to use it has been key to how far this project has come: multiplatform support, strong multimedia capabilities, a rich asset store, and ease of programming with C# are just a few to mention. Unity's board seems to have realized they can't do everything they want. Their leadership has changed since the latest events. Also, if they make really bad changes in the future, it will only affect new versions of Unity. So, I feel quite confident for the time being.
Thank you for the kind words about Sound Show :)