I would agree that Open Source tools can respond quicker, and changes can be made. However it's a double edged sword, as Jeff pointed out. Often there are people that changes things they shouldn't.

And forks cause other issues with support and understanding. If you've forked the tool, if it breaks or when someone else expects it to work another way, it can cause other issues.

Open Source solves some problems, but creates others. Microsoft has to make decisions and we won't always like them. I would like to see more add-ons and additions to things like SSMS rather than having it closed off.