Complex sentence: Even with all of this, it's overall survivability still is tenuous, since it must strive to win over the hearts and minds of the 75% of physicians who work in small offices in the United States.
Split into simpler sentences: Even with all of this, it's overall survivability still is tenuous. It also, must strive to win over the hearts and minds of the 75% of physicians who work in small offices in the United States.