In fact I would see the Jer 31:33, Heb 8:10, and Heb 10:16 as saying there will be a time when we won't need Scripture. because the Torah will be written in the hearts of men. That in the new coveneant Sola Scriptura, if it ever was valid, will be superseded by communication directly to the heart.
And 2Pe 1:21 says the old prophecies were not of the will of men but of the Holy Spirit moving men. That doesn't say that writings (the old time prophecy) are the only way the Spirit can or will communicate God's revelation to men. It only says that it's a way.
They're fine texts, but they don't seem to do the job you want them to do.
I don’t think one way or another about you. I do not know you, have only seldom communicated with you (in truth, most of the time I am not cognizant of responding to this one or that one—I just post and move on. If I have come across in an offensive way, I apologize. That was not my intention and is the reason I refrain more and more from engaging in these “discussions”—too easy to read emotions into them, where none is intended.
The point I was trying to unearth from scripture was that God’s desire is to communicate directly with His people (by His Spirit). John records the Lord’s promise of His Spirit that will guide His disciples into all truth. This was not intended only for those in His current hearing but all who receive His Spirit. You are correct about the OT verses I cited describing a future day when Israel would be brought back to the Lord, but the NT writer of the Hebrews cites the verse for the benefit of NT Hebrew believers who were in need of understanding the New Covenant they had been brought into.
In the meeting of believers I attend, we use the scriptures for all issues pertaining to life and godliness. Is the “church” important to us? Of course it is, it is where we meet, fellowship with/worship with like-minded believers. It is what the believer in Christ has been called unto. Does it play a role in our salvation? No. Salvation is all of the Lord. Does it play a role in our justification? No. Justification is by personal faith in the Lord Jesus Christ. Does it play a role in our sanctification? No. The Holy Spirit and the Word of God sanctifies. One’s presence in His church gives testimony to the works of God being done in the life a believer.