It is not a lot, something like 110-120 IIRC, but why bother with open questions? We had them in the past and they never brought a game into the top 10.
I can generate a list of all games released from Januari 1, 2000 up to and including December 31, 2019, with the numbers for number of news posts, comments and h-index. If someone is willing to go through this and select a reasonable short list of something like 100 games max. I can send that long list to that person.
We then can put that short list up for further discussion on the forums and perhaps reduce it further (or not). I can make a contest of the resulting list.
For this game of the decade, I think we should be able to vote for more than 3 games. Perhaps 10? Leaves the question on how to mathematically calculate the winner from that.