On the other hand, much of this had always been anticipated. E.g, Fermi's question from 1950 and the Drake equation are essentially based on the presumption of exoplanets. Or, the sensors (automatic mini labs) of the Viking probes in the 1970s were essentially based on the assumption that any life on Mars would be based on water (which in turn includes the presumption that there either are or had been significant amounts of water, an assumption strong enough to include this equipment, in the first place.) What has changed, since, is sensor technology.