pkgsrc has been written to be portable and works on Linux already. The way I see it, we have two choices, each with some pros.

Make our own package management:
Pros:

• Don't have to rely on other devs
  
• Only a few text files to maintain
  

Use pkgsrc:
Pros:

• Don't have to do any work
  
• 12000 ports already made for us
  
• Full-featured binary package manager already made for us
  
• Tried and tested system
  

Making our own package manager or ports system is a monumental undertaking and shouldn't be taken lightly. It's easy to say that a new ports tree would be easy to maintain, but really, it wouldn't be - it'd just turn into a nightmare.

I don't actually speak from experience, so someone who really knows what they're talking about is free to correct me.