Bitcoin is unsustainable.

There's a few key things that most people don't realize and some that people do.

1. Bitcoin costs $1,000,000 an hour to operate
2. It only has a maximum of 7 transactions per second
3. Transaction fees average over $26USD at time of posting.
4. Balance transfers take many, many hours and it keeps increasing.

The costs associated with mining Bitcoin are removed from the system to pay for electricity, rent, etc.

This is unsustainable.. We won't see 1st generation blockchain as king for long.

There are many alts who will be successors.. It's anyone's guess who will be the new king.