The reality is that both SMR and solar/battery facilities are being funded and built. It is not an either/or choice. Solar needs 100 times more land than SMRs. Large scale storage/batteries offer only 2-8 hours of storage and will not compensate during the long winter months in northern climates and also high altitude locations. SMRs offer reliable power 7 days a week, 24 hours a day.
What you miss when you say "Solar needs 100 times more land than SMRs" is that you can do other stuff with the land you use for solar. No reason you can't convert a parking lot to a solar farm and still park cars in the shade there. In fact, if you do that
everywhere you can generate between 20 and 25 percent of the Untied States electricity needs. That ain't nothing. You get even more if you make all roofs
solar roofs. And it is always going to be cheaper to deploy that stuff on an existing site than it is on a greenfield.
And if you make all of our farms into wind farms as well (which you can do just fine) you could generate about 11.4
trillion KWh per year. That's about three times current US electricity consumption. And we could still grow all the food that makes us fat.
How much storage you get depends on how many batteries you have. I agree that for high latitudes solar plus battery will work poorly, but I do not understand why you think high altitudes would be a problem. Solar works fine at high altitudes, arguably better because the sunlight is more intense. The fact is that if you look at the distribution of human population relatively few people live in high latitudes so I am doubtful that it really would be a problem.
The intermittency of solar and wind is a problem, but it is a fantasy if you think any nuclear plant is 24/7/365. You'd at a minimum need to shut down the steam turbine for maintenance and servicing for approximately two weeks a year.
We can also work with intermittency much more than you'd think. As one example, with EV charging we already have grid-tied EV chargers that can schedule charging for when power rates are lowest. If we ever have EVs at large scales we can use the exact same technology to load balance and only charge your EV when there is lots of electricity available. Most people who have an L2 charger at home or at work already have all the hardware they'd need to make that happen. And right now a lot of utilities will sell you the charger so they can load balance that 10Kw you are drawing when you charge your EV.
Geographical distribution also works for you. Yes, at any given location it might be cloudy or the wind might not be blowing. But if you have solar and wind at lots of locations the odds of it being cloudy or calm everywhere rapidly go to zero.
You can do similar trickery with refrigerators and freezers, hot water heaters, and dryers. Which are usually the highest power draws in any home. Same thing with HVAC systems in commercial buildings.