Well said! I have heard it say that "SEE we are in a new covenant and not that old covenant given by Moses!!" If you read verse 8 again carefully, it says that the fault was not with the covenant but with them as it says "For finding fault with them"

I also agree that we are not fully in the new covenant as we are still teaching each other. Once Yeshua comes we won't have to teach each other because...

Isaiah 2:3 "Many people shall come and say,
“Come, and let us go up to the mountain of the Lord,
To the house of the God of Jacob;
He will teach us His ways,
And we shall walk in His paths.”
For out of Zion shall go forth the law,
And the word of the Lord from Jerusalem."