BTG is planning a HF with different parameters that will require 2.5GB VRAM in order to become asic resistant. A new version of the miners will have to be made to support the new equihash algo: https://forum.bitcoingold.org/t/our-new-equihash-equihash-btg/1512
Other coins will follow with the exception of zcash. As we all know, zooko was bribed by Jihan Wu, so no HF is expected. Peter Todd exposed him in twitter. Ver and Wu hate Todd for being a pillar in Bitcoin core team and excluded him from the trusted setup of zcash. Furthermore, Todd said in a tweet, that zooko deleted his asic resistant algo. Anyway, this month the asics will be available for all, and they are 10x more efficient than the gpus with the current 144MB requirements for VRAM. If people are stupid to buy them the difficulty will rise to the heaven. Hopefully BTG and the rest could be mined with 3GB cards with the bios mods for the current equihash.