There's already an attempt at scraping the forum and relaunching a copy underway:
https://rpgmakerchat.com/
Good to see. At the very least, a LOT of the raw material is going to be saved by the time things close down, if they close down on schedule. The issue then becomes whether it will be made accessible in a meaningfully useful format (searchable, intact links and forum structure etc), and what happens to the community going forward.