We get asked this question quite a lot, specially in Drupal's issue queue.The answer to this is that any given module will be ported to the newer Drupal version when one of the following happens:
- Someone submits a properly formatted, working and tested patch in the issue queue. This is the most likely occurance, since people port what they need (scratch your own itch).
- A client funds the port for a specific module because they need to move to a newer version.
- We need it for a client project, or a personal site.
- We have free spare time and port it. This almost never happens, simply because spare time rarely exists.