We do agree that if both sides take few to no losses going into the late game, protoss can have an advantage. That said, we also know that terran players have a lot of offensive capability and harassment options at their fingertips in the mid-game. If terran players press that mid-game advantage, then protoss can’t necessarily get into the late game at their full potential, which can nullify any advantage they might have had. So, pressing that mid-game advantage is important (just as it would be important for protoss players to mitigate mid-game damage so they can to move into the late game in the strongest possible position). Ultimately, each game plays out differently, and depending on how the two races enter the late game, each side has a fair chance to win.
StarCraft II is designed with asymmetric design principles. We like having these differences between the races, as long as no one race or tactic offers a significant advantage. To put it another way, mirror matches already show us what StarCraft II looks like when both opposing forces have identical strengths at each stage of the game. In non-mirror matches we intentionally work to provide diverse strategies that make use of asymmetric design to produce varied, fun and interesting games, while maintaining excellent overall balance. That does mean that at different stages of the game, one race might have tools which represent an advantage against the others--though it’s important that those advantages can always be mitigated by good play.
All of this comes with an important caveat. We are already keeping a close eye on things and observing all stages of the game. If we start seeing our global ladder results shift dramatically or TvP win/loss ratios start to heavily favor one side or the other in major tournaments, we will deal with the situation accordingly.