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I don't think all Governments worldwide would Unite to fight against Bitcoin, I think it's too late for them now.
Why fight against something that can be monetized? Just look at how much money spot BTC ETFs have attracted in the US and everything will become clear to you.
I wouldn't agree that it's ever too late for the world's most powerful governments to crack down on Bitcoin - they have the ways and means to do so at any time. What would happen if the US, EU, UK, Japan, India, Canada and some other countries agreed to declare Bitcoin illegal and ban all CEXs? They wouldn't literally kill BTC, but I suspect that within 48 hours the price would drop by 80% or even more.
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I suspect that submitting a new block via the postal services may not be the most efficient way to claim a reward. However, it is my understanding that the essential mechanism of Bitcoin is not based on the Internet.
I think that such a slow method of block confirmation would not make sense, it would completely kill the idea that BTC is a cryptocurrency. Perhaps in the future there will be some alternatives for data transfer that are not exclusively related to the internet, but I think that until then Bitcoin cannot survive without the internet, nor can most of the things we take for granted today.