There is a fair amount of thought that has gone in to that, often referred to as the Wait Calculation.
An interesting example was "Interstellar Travel - The Wait Calculation and the Incentive Trap of Progress"¹, which somehow isn't on libgen [yet?].
1. http://www.jbis.org.uk/paper.php?p=2006.59.239 - The incentive trap of linking to a £5 download for fifteen year old paper is another paper entirely.