Again, Spain and Greece both had kings, both were on the other side of the ocean and both fell into the same pitfalls (I'll exclude Portugal and Italy now because the killing of the Portuguese king was way before Salazar and Italy had the WWII). Still, the Mediterranean society was very similar to Latin America with regards to political/economic dynamics.
Exactly, as I suggested, similar culture, similar pitfalls.
Respectfully, I find it pretty delusional to think that the simple presence of a chief of state can change a nation's fate during the 19th and 20th century. The continuation of the Brazilian Empire doesn't lead us to think that we would have a radical shift in Brazilian political or economic culture, IMHO it's quite naive to think that way.
Perhaps so, but I feel the reason why this conversation keeps popping up is pretty simple when you think about it. The First Brazilian Republic was a mess, let's just be realistic here. While it's not to say that the Empire wouldn't fall into some of the traps that the First Republic did (in fact, the economic turmoil and some of the social turmoil that occurred during the Old Republic period of Brazil was a result of policies dating back to the Empire post-Paraguayan War), But the 1889 Coup that came about further exacerbated the problems.
It was an oligarchic republic, ruled by strongmen alternating between the states of Sao Paulo & Minas Gerais, in particular the coffee oligarchs from those states, with support from the Army. The democratic vote was relatively curtailed during this period. To be fair, that too was partly the fault of the Empire, as the Empire's voting franchise was never big to begin with, initially curtailing the vote first to the upper and middle classes, and then to those who have the capacity to read and write, of which by the year the Empire ended in 1889, only 15% could do so. This was coupled with the fact that voting no longer became mandatory, something that the Old Republic failed to rectify, and in fact probably welcomed, since open elections would have broken the hold of the coffee oligarchs and senior military officers that dominated the country with an iron grip.
As a result of this, and the coup that deposed Pedro II, the Republic was unpopular, and saw several revolts in its history, the early revolts were pro-Monarchist movements, but later revolts were launched by the poor and down-trodden, and by junior officers who did not wish to continue to support for this oligarchic regime. This would ultimately culminate in the 1930 Brazilian Revolution that put Getuilo Vargas in power.
To some up, I do agree with you that Brazil's fate probably could've remained the same, the problems that it would've faced in this timeframe would still be there, but considering how many (but not all, I do believe that some of them did make a serious attempt at rectifying the situation) of the Presidents of the República Velha kinda botched the situation. I can actually understand why the idea of a surviving Brazilian Empire = Rise to GP status is actually commonly talked about here. I for one...think it is certainly is possible to change Brazil's fate with a different set of leadership...
...but I suppose that's because I don't believe in fate, now do I?