well fee are already very high and value is high too, what make yu think that the value will not continue to increase and the fee will follow the same fate? i cna't see anything that will make this trend reversed

actually right now it's the opposite because miners now are earning more than 500 btc in fee, which is too much currently, they don't need that with the current  value of bitcoin

also if the price remain the same as now you have already a very solid secure network