Jerry Smith writesEmphasis mine."The Guardian reports 'Each of the groups that will gather in New Mexico is competing to win a NASA prize set up to encourage entrepreneurs to start development work on the technology needed to create a space elevator.' It still might take a while though, progress is slow, so slow."
The progress to date has not been slow but incremental.
This is an important distinction. Incremental advances allow for a stable and mature system to emerge.
Stable and mature are things you want in your transporation infrastructure.