Everyone loves to talk about the 21 million cap, but we almost never talk about Bitcoin's dirty little secret: the year 2140.
That's when the block rewards officially run out.
Not Year 2140 perse since blocks are mined before every 10 minutes
Last block should be mined around a decade lower in bare minimum.
Any answer that's given Now is mere speculation and you also making assumptions
We can't really tell the future
Imo if Bitcoin is still existing till then, I don't see how miners fee would be a problem
It would show that the system was resilient, sustainable and has a place in that era.
Even if it's barely surviving then, there's something called difficulty adjustment.