Being Buddhist is about questioning even your own Buddhism. Relentless skepticism. Don't trust anything but the experiences you have.

People see the title and have negative feelings as evidenced by down-votes.

Of course, nothing would change! Buddhism is not about death you say it's about suffering - now. I am challenging you to say: What if I am provoked? What exactly is that composed of? Why is questioning your own belief resulting in avoidance?

It's not enough to say "Dhukka would continue" and "Nothing will change".

Death is one of the many subjects that create Dhukka according to Buddha. He had a lot to say about it. Removing this component of his formula should result in the same end-result you say? So why would it even be included in the first place. Is it necessary?

How does Buddha's concept of rebirth fit into a world without death?

What does Buddha even mean by death? Is it compatible with saying that people will never die, or are they incompatible interpretations?

It's not enough to accept an old preconceived notion of a word. Buddhism aims to change your definitions by experience. The essence in Buddhism is the ability to question your deepest beliefs and allow them to change based on experiences you have.

Again, many people will dismiss the title. It's all about suffering they say. Or maybe a universe without death is impossible for someone under the Buddhist framework - for impermanence should cause everything to change.

Well then, what is death? What does it mean to you? What does it mean to Buddha? And what's the difference?

I haven't thought about it much, but there are plenty of interesting questions that come from thought experiments. Such insight is core to Buddhism in my opinion.