It is weakly mentioned in the OP but what I want to express is that the discovery of an Earth-like exoplanet adds a data point to the position that life could be more likely and more widespread than previously expected.

It could be argued that such is not the case because the existence of habitable environments was not considered a rare circumstance anyway. Or it could be argued that the mere presence of habitable planets says nothing about the eventual inhabitation.

The OP made reference to the generation of life or as Cougar pointed out, emergence. The idea of mentioning emergence was to express the idea that if there are more habitable environments then there will be more occurrences of life emerging.

The OP made reference to the idea of an "evolvative" aspect to life that has emerged. The idea of mentioning evolution is to indicate the position that the more frequent the emergence of life is, the more frequent that life will evolve intelligence on the order of humans.

Therefore, with the discovery of an Earth-like planet it is more likely that intelligent life is more prevalent than previously thought.