Very good points and many of which I have as well. A bubble is something that is overbought and people are just shoving money in it with nothing to back it up.
That is the further thing from happening right now with bitcoin.
There is only 100 billion in crypto currency and just one financial institutes has 1.9 trillion in assets they can invest. That's just ONE! (Fidelity by the way)
We are far from the top on this, of course we will see ups and downs that's just natural but the overall trend continues to support growth with much room for growth still out there.