If it wasn't clear in my post, the entire point is not that we'd run out, but that it'd become economically unviable. As the supply starts to run out and/or we turn to more expensive sources, prices go up - sharply. We'll never really run out of anything - it will just become so expensive that it's no longer viable for widespread usage. Nuclear is quite sensitive to this issue because the primary, and arguably sole, argument for it is that it's cheap.

Copper prices may be higher in 2035 but I'll be astonished if lithium prices are. I expect lithium to be much cheaper by then.

Note that we kept extracting copper long after people said we would run out. We even increased production AND lowered prices.