First of all, wasn't DSL Debian based? So, can't you use another Debian based distro and be happy? What exactly is the loss here?
I just switched from PCLinuxOS to Mandriva. Big deal... I was even using Linux Mint, which is Debian based, for a bit over the summer. My files still opened, my computing experience didn't change much. I don't exactly see the loss here.
If I was doing a production based system within a company, I think I'd be sticking with a distro that has a long history and a bright future. Honestly, I'd probably be running CentOS, since it's compatible with Red Hat Linux, and have one machine running Red Hat with a support contract. Then, when problems do occur, I can apply the fix/patch to all the CentOS machines, as well.