There are some reasonable avenues of concern with Bitcoin. Mining does take a lot of energy, and energy can sometimes be scarce and also often come from very ecologically harmful sources. Bitcoin can also be very volatile, which can make some people, who are more used to fiat, very nervous. But the biggest challenge, I believe, is scalability. Once there's more adoption, the network gets congested, the fees spike, and transactions get stuck. That's a big problem if we want mass adoption of Bitcoin. As for a response, there are centralized solutions offering 'instant' transactions if that's what one's looking for, and some middle ground solutions like the Lightning Network, although I'm not sure how efficient it is these days.
The thing is that energy consumption isn't what people should worry about because mining bitcoin does cover a lot of energy and yet total combined isn't as much as people think it is so that is not the real worry, we should consider that energy is something that could be made for them as well because they could use solar or wind too.
I think the biggest issue for users is the fee and timing, you send some bitcoin and the transaction costs so much and it happens sometimes as late as half an hour later, that is our biggest issue. I get that people could be looking into something different at times, but we shouldn't really be worried about it. We need to consider the fact that we should find a solution to that if we know what we are doing.
