Redditor XTeena9 theorizes that Commander Lawrence could marry June in order for the plot to keep going (remember, Lawrence is very instrumental in Mayday, and it would serve June to stay in his house). 

"Could June marry Lawrence? Assuming the game is to stay and find Hannah, and stay protected while doing so...

But the question is - could they find a loophole to allow for such a union? Seeing that his wife died, and she might be pregnant with his child, even though handmaids are not worthy of being wives. Maybe he plays a grieving widower card and uses his influence, especially if she's pregnant?"

While it's unlikely that Lawrence could marry June (handmaids just do not get married, especially not to commanders — plus, it would be too easy!), he could be forced to get remarried to a woman who is a true believer. Kind of like how Nick is forced into marriage with Eden — although Lawrence is much older. Will Commander Lawrence (played by the fantastic Bradley Whitford) be back for Season 4? We sure hope so.