Should Christian couples enter into prenups?

Prenuptial agreements appear to be growing in popularity, but Tony Wilson believes that Christians should avoid them. He explains why 

The majority of people think pre-nuptial agreements - which set out how a couple wish to divide their assets should they divorce - are a force for good. That’s according to a recent survey by JMW Solicitors, where 66% of nearly 2,500 respondents indicated positive feelings towards them. 

Once the preserve of the rich and famous, these contracts are now considered beneficial to couples of modest means. According to JMW, prenups have become “a mainstream option” over the past decade.  

But doesn’t planning to fail undermine the nature of marriage itself?