There is still selection pressure today, not because you are too weak physically to make children, but because of sexual selection. Many people have a hard time finding a partner, often due to genetic issues. On the other hand, many people have genetic traits that help making them highly attractive and able to give their genes to many people.

So selection is still around, but nowadays we select for different things than nature used to when medicine wasn't as well developed as it is today.

Note that this selection alone won't cause any genetic change faster than what existed in the past. What really accelerates changes in the gene pool is us deliberately doing them. We'll start with eliminating hereditary diseases, but I don't think we'll stop there. We'll likely study which genetic variants give rise to desirable traits and then make those mutations to upcoming children of interested individuals.