I can see separatism becoming a problem for Brazil... 30 years from now, but nowadays, no.
Eh, separatism in Brazil would be like the Conch Republic. Theory is great, but I want to see the foo' that has the idea of doing it and how the hell they are going to defend borders of a newly minted states from the central government. Not even the crooks of PT and allies would want to get separated from the gravy train.
Also, but I do seem to recall that most of our compatriots are located in the coastlands with the exception of Sao Paulo and few others. Now, if the cities try to go SEPARATE, some of them you can just cut off trade, go on siege mode, and wait. I want to see how people who allowed crooks that can't remember how much they stole deal with faulty logistics, scarcity of food and trade.
Now, what do I see becoming a problem? Faith...to a degree. Because for some reason the last 20 years we saw the rise of Protestantism from like 5/7 per cent to 30/35% (?) in Brazil.
As for Greater Venezuela... pfft, their Armed Forces are in much worse straits than the Brazilian ones(although the Brazilian Armed Forces might reach there eventually).
Venezuela has already a shitty record with us and Lula is throwing them down the bus...or the Amazon. We might have an easier US Brazilians creating a South Venezuela than them annexing even a fraction of Brazil. Had not being wildlands in the Venezuelan Amazonas State Bolsonaro might have considered doing that.
What about Venezuella supported by Moscov and China?
Brazil has good relations with both of them, and both would like for things to stay the same(at least for now). Like I said, this isn't something to worry about now(pay attention to; yes, worry about, no).
Even during Bolsonaro Brazil got chummy to China but because of the "beef" "cartels" and agribusiness.
My mom's worried about Iran/Russia/whoever is allied with Maduro's Venezuela but that's almost a non-issue, because as
@gral mentioned...we are on their good side even with a nationalconservative president and vice versa. So there's no point in worrying about an invasion from the North... I would be more worried who succeeded Maduro.
Now I would take the word over because I can't get as many updates as of now. I have been distant from the homeland a decade by now.