. :)People move from different reasons in the winter, usually emotional ones: marriages, divorces, unhappy roommates, health, etc, however in the winter there is nothing convenient about moving. 

My wife and I have house hacked/had housemates for 27 out of our 32 years of marriage. 

When marriage problems occur all the pros/cons change and there are other legal remedies that will come to bear. 

On a positive note, marriage is happening soon so I will be able to reap some of those benefits.

It's not worth the strain on your marriage, and there are plenty other ways to make it in real estate.2.

She would work for the first couple years of our marriage and we would live exclusively on her income.

Making deals with strangers on the internet probably has a lower success rate than Tinder leading to marriage. 

One or two truly minor missteps, or several years old and having redeemed themselves since with stable employment, savings, perhaps a life event such as a marriage; then they should get serious consideration.

Can I limit my leases to a year in the event of unforeseen events in my own life (marriage comes to mind)?

Often people get success with business and pour unlimited hours into that because in other parts of their lives like marriage etc. it's tough and they run from that.