The Pig and Future Change

ואת החזיר כי מפריס פרסה הוא...
The Torah uses these words as a condition, i.e. as long as the pig has not reverted to chewing the cud it may not be eaten. In the future, when it undergoes evolutionary changes so that it will become a ruminant, it will again be fit to be eaten by Jews. It is not the Torah that will adapt to "realities," but "reality" that will adapt to Torah; the laws of the Torah can never be changed. However, the nature of the pig will change.