Not to disagree with anyone, but if we look to the example of Rabbi Akiva as stated explicitly in Brachot 61b, it says that he fulfilled the mitzvah of Kriat Shema by ending on the word "Echod" at the end of the first posuk only.
It explains that as he was dieing during his execution, he explained to his students that he had waited all his life to fulfill the mitzvah of Kriat Shema properly and that he prolonged the pronunciation of "Echod" until his soul left his body. It goes on to say that in the merit of that single act a Bat Kol (a Heavenly proclamation) went forth saying that Rabbi Akiva merited to life in the world to come.
The Alter Rebbe explains in the Kuntress Acharon section of his Shulchan Aruch that the halacha follows Rabbi Akiva even against the majority.