Mining is indeed needed to produce some things. But then those things are not expendables and can be recycled after decades of use. And we're no longer mining stuff that we literally use once to burn it like oil, gas, coal, etc. I'd call that a net win.
LNG, nuclear, and coal are each way too expensive long term. With solar prices continuing to drop, this is only going to get worse. Coal is already being decommissioned in many countries. China is an exception but only because they are growing so rapidly that they can't keep up with clean energy deployments (despite having the largest deployment of that world wide). That's an effect that is short term. They actually announced their grid will be 100% renewables by 2060.
New gas plants (the least expensive of those 3) at this point don't make a lot of sense either. The investment pitch is horrible: we'll be producing energy at about 3-4x of the current price of renewables for the next 50 years. By the time those 50 years are over it might be as bad as 30x. It goes from bad to worse. Nuclear needs to get a lot cheaper to be interesting for investors.
Grid infrastructure is indeed a short term challenge. Having more solar and wind on the grid is causing grid operators to evolve what they are doing to fix that. A few decades is a long time to address issues though. Batteries and cables seem to be what is needed here. European and North American grids seem to have issues getting permits for new cables. E.g. Germany needs more north south cables so people in the south can actually use the wind power generated in the north. But putting a few hundred km of cables in place seems to be a hard problem from a bureaucratic point of view. It's not a technical problem though. We've known how to make electrical cables for a long time. Though there is of course some innovation in that space as well to enable more efficient long distance connections.
Cars are electrifying at the pace we can ramp up battery production. Even so, there are a lot of cars in the world and most of the new ones are still not electric. That will flip around towards the end of this decade. From then, decline of ICE could be pretty rapid. The cost advantages for owners will drive this.
EVs are a growth business in a covid year and are very profitable. So, car manufacturers are already going as fast as they can here. Interestingly, you see the same kind of learning effect with battery as you see with solar panels. And with wind power too. All of this combined means things could go a lot quicker than some companies hope/expect.