From married filing jointly 2015 to married filing separately 2016. I need to do it for student loan debt. Can I change back to jointly in future? Any consequences?

I have filled Married Filling Jointly from 2012-2015. I wants to change it to Married Filling Separately for 2016 due to my wife's student loan debt. My question
1. If I change it for 2016, can I change it back to Married Filling Jointly in 2017? I can not change it forever or I can not change it for few years only
2. What are the consequences (I am aware of deduction) of changing filling status back and forth.