The downside is taking a point off the board too early. If you make it a 4 point game, you can score a touchdown and a PAT and be up 3. If you go for it too early like SU did, you leave your team down 5 with more than a quarter to play. Then if you get a touchdown, you are up 1 and are still chasing the point you did not get. You have to go for two and you fail, you can lose by a field goal.
Also, by going for it and failing it certainly did not help our momentum. Now, granted, if we got the two it would've helped us at the time but tt was way too early . If there was 12 minutes left in the game, it's a no-brainer to try for two and make it a field goal game. Why risk chasing that point when there's a quarter plus left to play. It's bad strategy and the basic strategy is to kick the extra point. They have charts and stuff for conversions. Every chart coaches have says that you do not chase points in the 3rd quarter. Period.