$1 trillion per Bitcoin, or a $1 trillion market cap? It's already been over $300 billion before, so achieving $1 trillion is certainly within the realm of possibility.
If you had read the first few posts and clicked on the link in post number 4, you would have seen that at least according to the author of the article it is about the amount of $1 trillion per BTC, and not about market cap. If we were talking about $1 trillion MC, then in that case the price of 1 BTC would be around $50 000.
For all the other questions read my previous post, I think I have somewhat explained what this is all about.