I doubt it

Evolution removies traits that make the organism less suitable to survival, as those that have that trait are supposed to die before being able to reproduce, as members of the species with a more suitable characteristic survive to pass on the genes for that instead.
Nax: I'm pretty sure that, if we were to near any such world altering event as that, that you would see scientific research accelerate to try and find ways for us to survive it...
As we treat diseases with medication today, natural immunity is no longer bred into the species...those who suffer from sickness do not simply die anymore, but are given treatment and helped back to health...and go on to have kids in later life, and their genes that were vulnerable to that disease are passed on.
The increase in average height is actually due to better health care and nutrition in the human diet; our genetic makeup hasn't changed over the last 90 years or so, we just have better health care, leading to less people suffering from malnutrition during their growth cycle.
Our answer to everything now is to find a way round it for the entire population...we simply don't allow those less suited to an environment to die and allow natural selection to occur. Every single facet of our society is influenced and altered by technology, and we use it as a shield against nature's whitling process.
Given our level of sentience, it's hardly surprising...we're not, after all, likely to simply let members of our society sicken and die. Humans, therefore, are limited to evolution on a cultural level, rather than a physical one.