Well, in many Zalfie fanfics, it can go either way. It could be a heartwarming 'yes' with a sweet ending, or there might be complications and a 'no' for a while before a change of heart.
The poem was not explicitly written, so it was impossible to determine who wrote it. It was a classic proposition in literature, expressing the beauty and infinite possibilities of love.
I haven't heard anything definite. Maybe there's a chance, but it could also be that the story has reached a natural conclusion. We'll have to keep an eye out for official announcements.
I'm not sure. It could go either way. Sometimes characters come back in unexpected ways in manga. Maybe there'll be a twist that brings Gojo back into the story.