I think Bitcoin will ultimately have to be a store of wealth instead of a transactional currency. There are too many competitors like Stellar, Ripple, and many many more that do not require nearly as much energy.

This doesn't mean Bitcoin is worthless. By requiring so much energy and investment to mine, the currency is ultra secure. A 51% attack now seems so unfeasible that only the largest of countries could actually do it. That's pretty incredible for a digital product. I see people buying houses and cars with Bitcoin and buying coffee and lunch with lumens.