It’s astounding how much more is known than, say, 15 years ago, and yet detractors of this kind of research keep implying the existence of precognition regarding what we will and won’t find, or developments in propulsion. :’)
Based on the rate of increase in the number of known exoplanets, fifteen years from now they will number in the many thousands, and discernable size will drop by another factor of ten (at least).
Our technology is advancing at an incredible rate and its just not possible to say what will be possible a few decades from now.
It seems that every time we’ve decided a planet can’t be somewhere, planets are found there.