I log into the forum every day. Even if I subscribe to at least 3 models daily, that adds up to 1,095 subscriptions over a year. 365 x 3 = 1,095. Over three years, that becomes 3,285 subscriptions. I have been on this forum for over three years now. For most models, a thread might only be updated 3 to 5 times a year. 3,285 x 3 = 9,855 / 365 = 27.
This means that every day I get about 25–27 new threads, which fills just a single page. This is the roughest estimate; in reality, there are more subscriptions. Therefore, the 2,000 subscription limit is way too restrictive.