I'm loving what Tommy Armstrong is showing us so far, but I don't think it's enough to unseat a healthy Martinez. Armstrong hasn't faced adversity in a game yet, and we know that Martinez has the ability to rise to the occasion it tight spots, even if he is mistake prone at other times.
Going back to Martinez's freshman year, even as bright as his future looked, he still had a number of freshman jitters that cost us, and almost any freshman starter can expect the same growing pains. I would still prefer to have Martinez in those situations when we get to the tough stretch of our schedule, assuming he is healthy enough to be out there.