[dsp1234]

What makes you say this?

About half of nearby stars that we can observe[0] have planetary make up that is different than our own Sun. By definition, the rest either have a make up that is like our own or not like our own. So let's assume that every single nearby solar system looks exactly like our solar system, we are just unable to detect that they are at this time. That still means that our solar system is distinctly different than half of the other solar systems. That ratio of difference will never go lower, it'll always be "The solar system is different than at least 50% of other nearby solar systems". But after we do more observations, it might be 60%, 70%, 80%, etc.

Or in other words, as the original commenter said, "It is certainly possible that the more we study the rarer it will become. (It can't really go the other direction at this point.)".

[0] - FTA, "Of order half of nearby stars have at least one (and often several) worlds with masses substantially greater than Earth and orbital periods ranging from mere days to weeks; in our system, the space interior to tiny Mercury’s 88-day orbit is entirely empty."