I don't know what to think about splitting into regions. Personally I wouldn't want that to happen because I think it would be worse, but I am biased as I am strongly against tribalism - ie I wanted a united states of europe and closer ties with the US, Canada, NZ, Australia and all aligned countries. The only logical defense for things to come is in my view closer ties and unity. It worked during the last cold war, it should work now, but as challenges are growing I think what we have in place should be further galvanised.
What I am worried instead about is increasing authoritariasm on both sides of the political spectrum taking places in all western and western alined countries, which may lead to further fragmentation and further encouragement of our foes.