I agree with all this. I don't think Proof-Of-Stake = failure is impossible. I even think it makes it more likely.

A business that grew up from the ground without VC capital is stronger than one that was built on it.

This is why BullBitcoin is the Bitcoin standard of exchanges. It grew up from the ground up with very little starting capital. Most of the growth was obtained by generating profits. Because of that I cannot imagine BullBitcoin failing ever. It's a strong business. Pure Proof-Of-Work.