Do you have an idea how this could be calculated mathematically speaking? I'm now really interested in this, but I don't know how to subtract the trend from the volatility.
I have opened a new thread for this, and I have an idea and modified a Python script I already had written for another purpose. However, I'm not sure if my approach is correct, because the difference between the "raw" and "trend-adjusted" values are very low. See here for the new thread.I am not sure when we will reach it, but I think that we find ourselves close to the last stage of Bitcoin's growth before it becomes the largest asset class.
I get what you mean but for me it's a bit excessively optimistic 
The big question is if really a domino effect as large as you say would happen, because near the end of this megabullish move the returns would be small again, and if investors predict that correctly, then that bubble could be much smaller than expected. There are many people in this forum who believe this theory though, so I may be on the more cautious end of the spectrum here 
And:
If you had told people 10 years ago about the price reaching $100k how many would believe you?
For 2015 I agree, but in 2017 when the first bubble with real mass adoption (e.g. mainstream rappers writing songs about Bitcoin and such stuff ...) occurred, the price already touched almost $20,000. In "Bitcoin terms" this was already close to 100k Agree with the other parts of your post. I actually don't think such a superbullish scenario is impossible, but Bitcoin doesn't rely on such a scenario in my opinion. A "popular internet currency" at $100-200k which slowly grows would also be nice.