The wait calculation doesn't really apply to this project. The whole basis of it is that new technology can't speed up probes you have already launched. This is

The wait calculation doesn't really apply to this project. The whole basis of it is that new technology can't speed up probes you have already launched. This isn't true for these probes as improvements in technology can be used to increase the speed of the probes that have already been launched. It also assumes that the bulk of the investment is in the hardware that's launched. With this project, the expensive stuff stays on the ground, the probes are cheap.