There is a definite trend toward women wearing larger watches, just as there is for men.
However, I do not believe that the trend is here to stay, as it would be completely unique in the history of man for a fashion to remain static forever.
Hemlines change, the cut of trousers change, the width of belts, ties and lapels, the shape of shoe's toes change, as do the the soles from thin to thick and back again. Hairstyles dictate long hair and then short hair and sometimes hair that point to the sky and sometimes looks like you slept in a dumpster.
We are in an age of wretched excess in terms of almost every fashion from cars to watches, but there is nothing to make us believe that there will not be a return to more discreet fashion trends.
It is simply the way. What expands must contract.