What was true then is true now. Episcopalians believe in transubstantiation, Lutherans believe in consubstantiation, and other denominations believe that the Lord's Supper is merely symbolic.
The principle of "Scripture alone" didn't provide unified Christian teaching regarding this important topic. Nor has it ever regarding a whole range of teachings, ranging from the necessity of Baptism to double-predestination. This is important to keep in mind considering our Lord's express desire that "they may all be one." Has Sola Scriptura promoted Christian unity?
Probably just as much unity as there was in the church at the time of the beginning of the Reformation without it. And I would hope that you won't tell me there is unity in the RCC today. I can just read the headlines to know better.