I don't think you understand what I said. The demand should outweigh capacity if fees are to rise. And fees must rise significantly if the chain is to remain secure many years from now. And regarding capacity....firstly, Segwit, Schnorr and other optimizations + LN will drastically increase capacity. Secondly, it's not clear that fees are discouraging adoption at all---data, please? For those that view BTC as digital gold, 10 or 20 cent fees are not discouraging at all.
Miners earn about $7000 every 10 minutes now. A few months ago it was $12000. It was never a given that mining should earn this much. I know that eventually all revenue has to come from transaction fees, but to do that now would mean either having 25 times higher fees, or 25 times more transactions (and more users) at the same fees. Or a 25 times higher value, or somewhere in the middle a bit of everything.
Bitcoin was also secure when miners were earning much less dollars per block.
For as far as fees discouraging adoption: I don't have data from that. But it's easy to see that blocks are full, and full blocks simply mean it's not possible to do more transactions.