Honestly, I do not support this (but it does not mean that I do anything about it; read next part). This is due to the fact that it will attract a lot of signature spam that it did not had previously. However, it tends to be okay. If you have a question to ask or have something constructive to add to that subject, it is better than opening another thread about the same thing. Just make it so that it doesn't look like a useless(spam) necro post. Then your post shall not be deleted.
I umderstand what you mean, well I am referring to those useless posts that doesn't even make sense at all, they'd just bump a very old thread just like the guy di which is an obvious spam. And oh btw, I noticed the posts in that thread got deleted already.