With the release of Hamlet Defense in more zones, it'll be easier to get into the Top 20. However I think it'll become harder for a particular Hamlet to get its Supply Rating up, due to the distribution of players contributing items.

However, as Thevedis mentioned, people can stockpile items and get themselves into the top 20 and the Supply Rating up regardless of what other people do. I mean I know on Balmung one person alone contributed more than 1.4 mil points on the last run. However, most other players didn't come anywhere close to them.

Another issue to consider, most people have been obsessed with beating Garuda since 1.22 has come out so that may be another variable to consider.