I'd happily sacrifice the speed of plane travel for a slower forms of travel with none of the hassle and discomfort of being stuck at airports while flights are

I'd happily sacrifice the speed of plane travel for a slower forms of travel with none of the hassle and discomfort of being stuck at airports while flights are delayed or canceled, or the lack of personal space while in transit, regardless of the need to reduce our ecological footprint. But only so much - taking a week to travel what takes 20 hours now doesn't seem so bad, but a month would be crazy.