PPM is unmaintained for years, it's unreliable (especially when used with Debian packages) and it makes it very easy to break your system.
Anyone who wants PPM back should either:
- Volunteer to maintain PPM: fix known bugs, fix its architecture (for example, make it understand a situation where package a depends on b or c - if user installs a but c is present, no need to install b), make it less CPU intensive and make it faster, or
- Find somebody else to do this