The two-year marriage license?

Mexico seems to be debating introducing temporary marriage contracts that expire after a few years. It seems to me to not be that far off from the way a marriage with prenups currently is possible given no fault divorce. (It's also somewhat different than another approach used in certain parts of the Muslim world in which temporary marriage is more or less a cover for prostitution with the minimum marriage length there being a half hour versus 2 years in the Mexican case).

I'm not quite sure that this really changes much of anything - just playing with the verbage the state uses rather than really changing anything. The question I'm wondering about is, given that judges can already void prenups, is whether something similar might happen in these cases.