If we perpetually increase capacity ahead of demand, fees will never rise. Transactions will always be free or nearly free for users. This will not end well in a future where block subsidy ends and fees alone must support the security of the network (by incentivizing miners). If we did this, we are basically depending on mass adoption and skyrocketing price being guaranteed. That's probably not a good engineering decision.
Right now, transaction fee represents less than 2% of the miner's income. The remainder comes from the block reward. This percentage is going to increase in the future, but no by much. By 2030 or 2035, the tx fee may cross the 10% mark. If we increase the tx fee, that will do more harm than good. The usage will go down, and there will not be any significant increase in the miner's revenue.
The remainder comes from the block subsidy, which in a few years will be 6.5 BTC per block, and a few years after that, 3.125 BTC per block. Why would you assume that transactions won't make up for the loss in subsidy? Why, that was the whole premise of the system---that fees would eventually replace subsidy. Bitcoin has a finite supply. You say fees will never amount to subsidy; well, rationally, that suggests that in the future, the Bitcoin network will be significantly less secure than now. Perhaps we will see such drops in hash rates that mining tech from previous generations could be used to attack the network and cause block reorgs.
Eventually the transaction fees would replace subsidy... But that is going to take a long long time.... May be another 50 or 60 years... Are you sure that Bitcoin will survive for that long? Even if we assume that BTC is going to survive that long, the high transaction fee would mean that very few people could afford to transmit BTC.
0.0002, and I don't think that people would be really happy if they are forced to pay 100x of that (imagine paying
0.02 in tx fee).