Free Idea For The Taking: Smart Contract To Start a Revolution

I just read about the resistance that is very slowly and very hesitantly forming against president Putin from within his own ranks in the Russian Federation.

There is obviously a pattern of "leadership by fear" in autocracies. Any dissidents need to be squashed, locked up or "given a cup of tea" quickly before they can create an organised alliance. Once the brave find a way to rise up together it might already be too late.

What if there were a Smart Contract on the blockchain that:

• Allows people to show their support of an opposition anonymously, by adding their signature to a list
• The list is owned by nobody and the names stay unknown until a certain number of people have signed the list
• The list will not be revealed if that number is never reached; nobody will ever know that you signed on to the opposition if the number is not reached
• If the minimum number is reached (or has been reached by a certain point in time) the list will be published along with the statement

Is this a potential use case for a blockchain-stored smart contract? I have not a lot of technological knowledge but would love someone else's take on this.