I'm not sure that'll be any time soon. Seems like the Powers That Be's main goal is not to wipe out Christianity, but to pervert traditional Christian teachings as much as they can. Many churches are embracing LGBTQIA+, teaching Jesus was just a good teacher, all religions are true, etc. This way they can say 'see, we're not trying to stamp out Christianity! You guys aren't being persecuted!' A lot of people think that'll only grow traditional churches, but I think it'll only wipe out more & more of them. In time, the mainstream churches will die off as people realize there's no difference between them & secularism, but I don't think that'll be a long time.
Also, it seems strange to me you seem to value traditionialism.