I think Mole125's answer covers the whole thing quite well. It will be done if it's either interesting enough, or easy enough.
As he said, it's quite hard to say "no-one will fix this script" since it's a few script developers who doesn't have any real contact besides this forum. They do not have any communication about your script in between them.
That said, the idea has been to open up script development for more users and therefore have more who could help out. This has been postponed, with time being the factor of that. We always fight vs time for all tasks.
The fact that it's Target's script doesn't stop anyone else. All scripts are open source and the source code may be re-used by others. It could be seen as good ethics to let the original author have a chance to do it himself if he is interested, if not, just clone the script and change it into your needs.
You could maybe get a chance to get some more pointers and an estimate of how hard it is, and what you could change to make it easier if you linked the threads you are talking about. I am aware that there are many many "new script required" threads though. But they all are there for different reasons, though time probably is the most common one.
I could imagine myself being less interested in spending hours on creating a script for someone else's challenge if I did not like or approve of the challenge for example. In some cases it could be a very small rule change to make it work with current scripts, though I think that the script writers tries to point that out then. From the posts I have read, it seems like they really try there best to help out, but it's a lot of people to satisfy.
Currently there seems to be 77 unhandled requests (waiting for feedback, new script and so on), 409 completed requests and 106 which has been denied because they are technically impossible or just not allowed.
I am honestly unsure how many who is actively helping out, but I would assume that it's around 10 people. So those 10 has handled about 500 of 600 requests in one way or another. In my mind they have helped the community a lot.
But I agree, it would be better if more could be helped, and if we at Project-GC could make that happen. Especially since it's probably the new-thinking innovative challenges that actually won't get published.
I had a new idea myself. I didn't manage to write a challenge checker that was fast enough myself, so I asked Target for help (since I know him personally). He liked the idea, spent quite a lot of time on it and proved that he actually has the technical potential to solve it. However, his time is also limited and that was two months ago. Nothing has happened since then and I really don't blame him. But that one was really complex and it would probably be a few days to actually solve it, which is quite a lot to ask for. In most cases I think checkers can be written in 1-6 hours.