When Love Feels Dead, Should The Marriage End

I understand why some think their marriage is over when the love they used to feel for their spouse now feels dead. After all, it seems ingrained in our thinking if something dies you must get rid of it and replace it.
A lot of people view love as something akin to planting a tree in the backyard. If it dies you dig it up and replace it with a new one. Or, when a pet dies and you replace it with a new one. We do the same with a lot of our relationships with other people as well. When friendships fade and die off, we look for new ones. When leaders or mentors lose their place in our lives, we find replacements.
feels dead 
It’s no wonder we approach marriage with the same mindset as we do all these other relationships. The feelings of love can and often do fade. And there are times when those feelings can be outright flat lined, dead, completely gone. But does this mean the marriage has to be over?