Personally, I'd rather have an old thread re-awakened rather than a new thread created assuming the post is on-topic.

However, this is different from people posting to threads which have been broken up due to size.

In those cases I prefer the continuation thread be created including a link back to the original thread, and then a link created in the old thread pointing to the new thread, and the old thread locked.

Of course, I also prefer to be able to edit an old post I created indefinitely so that I can keep the links up to date, etc.

YMMV.

-john