So the whole world is going to face that 48 hours without internet or just the website can't be accessed?Because in the article you have linked says that most of the domain names will be unacessible so even if the ISP provides their services what site we are going to search?
What will happen to bitcointalk and crypto community?
If you read it carefully than you would know that it would only affect the internet users whose service providers have not been prepared for this incident. Rest all will be working as usual as some initial precautions can make this whole process ineffective to the users.
I think Bitcointalk will have no effect due to this specifically as it depends on the internet connection of the user.