It's worth noting that "ASIC Resistant" algorithms like Ethereum's Ethash just mean that they're designed in such a way that creating ASICs becomes expensive and with harder to achieve gains, Ethereum mining for example has been dominated by ASICs for quite a few years now, but the high memory requirements means these ASICs need updating regularly or to ship with lots of very fast on board RAM for a given launch date.
GPU Mining coming into use again is more from the rapid increase in value creating instant demand for mining transactions beyond that available in total current deployed ASICs, no one can get ASICs fast enough to fill the demand so GPUs are the 2nd best thing, with time the GPUs should again be replaced by ASICs for long term profitability.