I don't feel like raising the marketcap of Bitcoins to circumvent the 21 million problem is what the crypto community really wants. We all are aware that the huge energy consumption for crypto mining is a problem. But the rest of the world is also constantly increasing its energy needs. Its just a matter of time that we become more efficient in the harvesting of energy. That's why we can't look to far into the future based on our current technology at hand. Technology advancements are going to help solve the energy problem.
The attractiveness of Bitcoins is the hard cap of 21 million, it stops inflation reducing the value of the existing coins. For me this also means the bitcoin price is going to stay on a upwards trend. While the price for 1 bitcoins keeps going up we can trade in even smaller amounts going forward.