It's not like everyone who knows about the game is going to know that this petition exists. Even among people who are paying close attention and want a physical release, I know a few that have just given up on the game entirely and don't want to hear about it anymore, and they certainly don't know about this.
A petition is always going to garner far less signatures than the amount of people who care about it, especially when they have to give away identifying information like a name. Given the time we've known about this and the percentage of people who would have heard of it, the current amount of signatures is actually a bit higher than I would have expected.