Im not sure how bitcoin fees will be sustainable long-term.

[Decoded]

So i'm just wondering. I may be mistaken.

I've always thought that the bitcoin fee will increase linearly with each reward halving. So let's fast forward 100+ years to 2140, when there are no more coins being produced. Wouldn't the fee have to be somewhat near what it is today? Around 15 thousand dollars per block?

If we were to divide 1 megabyte (1000000 bytes) by a basic transaction size, maybe 300 bytes, we get 3333 transactions. Divide $15000 by 3333 and you get 4. Which is very high...

Am I mistaken?