moshe rabbeinu - If we lost smicha, isn't our mesora broken?

We assume, and indeed our religion is predicated largely, on the fact that we have an unbroken chain of transmission from Moshe at Har Sinai. Originally, and until the times of the Gemara (as most assume), we had an unbroken chain of smicha, from Moshe, to Yehoshua, and on so that anyone who had smicha was as if he was trusted by Moshe himself. With the previous generation's approval, we know that the mesora we have is correct and true.

But we lost true smicha after the times of the Gemara? So wouldn't that mean that our mesora then is broken? How do we know that what we have now continues to be true and real?