about hiring, i dont think you need to worry now because there isnt any plans to stop that in mid-terms. i believe myself most airlines will keep hiring strong in the next 3 years, unless something happens like a merge or some unknow crisis. all airlines have massive orders for new aircrafts, TAM, GOL, TRIP, AZUL, Avianca and every time we hear rumours about a new airline, another one will start operations in september, Mais linhas aéreas, they are starting with 2 Fokker-100.
The thing about opening market for expats is something thats still being discussed among some politicians. A congressman created a project to do many modifications in the brazilian aviaiton laws that is quite outdated and among those modifications he proposed an opening for expats pilots, specially helicopter off-shore pilots, but its something that will take some time, IF this happens, that i dont believe it will, may take in my opinion at least 2 or 3 years to vigorate, so no worries here as well.