- Dump everything, because keeping the site just because of 4 forum posts per day isn't worth the money.
Problem: Death. - Leave everything as it is. Upgrade to phpBB3 might be done. That will cost me money, as I'll have to pay for the hosting and the domain.
Problem: Where to get the money? - Migrate to my company's hosting (Dreamhost). That way I'll have to pay only for the domain, which is fine.
Problem: It doesn't support multiple FTP accounts per user, so the hostees would be probably screwed.
Solution: Redo whole drdteam.org, including hosted sites. The CMS of choice would be Drupal (which would also bring some cool features to the site in future). The hostees would be able to create content & upload files through it's user interface.
UPDATE:
SoulPriestess offered me a webspace and I took the offer. It means that everything will stay as is (at least for now), except that drdteam.org will be under his (her?) control (I'll still be around doing practically everything I do now). The move will commence in few weeks.
Comments are welcome.