That end is not the end of the world as it is perceived to mean, or even the end of our natural body, but rather the end of the old man. If it is no longer you who lives, but Christ who lives in you--that is the end, all things have become new (in Christ).
I like what you are getting at, but I do disagree. I used Matthew 24:13, but there is another verse that says the same thing (actually 2 others, but they are different accounts of the same thing). with the Matthew 24 verse, Jesus was asked what will be the sign of his coming, and the end of the world. Jesus talked about wars, rumours of wars, earthquakes, pestilence, nation's vs. nation's, persecutions, etc. After describing all this, he says if we endure to the end we will be saved.
That's verse 13. Verse 14 says that this gospel shall be preached in all the world, then shall the end come [paraphrasing].
I can see applying this to your spiritual journey, but Jesus was talking about literal things here.
Now Matthew 10:22 and Mark 13:13 are accounts where Jesus said the same thing, but in a different sermon.
Matthew 10:22 KJV
And ye shall be hated of all men for my name's sake: but he that endureth to the end shall be saved.
He was describing being persecuted as a believer and facing death. So with these verses I don't agree with you either. But again, I can appreciate the spiritual application.
Consider this verse:
1 John 2:19 KJV
They went out from us, but they were not of us; for if they had been of us, they would no doubt have continued with us: but they went out, that they might be made manifest that they were not all of us.
This verse says that some were counted as Christian's but really weren't. The sign that they weren't is that they didn't continue (they didn't endure to the end).
But let me bring up this verse:
John 6:27 KJV
Labour not for the meat which perisheth, but for that meat which endureth unto everlasting life, which the Son of man shall give unto you: for him hath God the Father sealed.
Now THAT'S a verse where your commentary is 100% accurate!
So again, I do appreciate what you said, and come to think of it, my pastor has even said, "your life ended when you met Christ!". Nonetheless, these verses speak of remaining in Christ through your hardships to the end of your natural life. It's not enough to have faith, you must remain faithful.
There may be exceptions when it comes to conditions like dementia or other mental degeneration. I don't know... I only pray the Lord has mercy on the once faithful who suffer such. Maybe there are other things as well... But in general, I take these verses (with the scriptural evidence I mentioned) to mean the end of one's natural life.