Talking with some friends they say it is getting better, albeit slowly.
Problem is that, as alemaobaiano said, this kind of investment is not something easily seen by the general public, and thus, politics will not give priority.
Last week we had a power outage at Sao Paulo approach control, and back-up generators did not work. Departures were suspended for almost two hours and no arriving traffic was allowed into the terminal area. Fortunately it was a lazy Saturday afternoon, otherwise chaos would have ensued.
Cheers
BF