Sankharas, once eliminated. Do they have a chance of coming back?

When I talk of sankharas, I mean the pattern of the mind and the way in which the sanna recognizes an object. After prolonged Vipassana and remaining equanimous to the body sensations, Many of my thought patterns have changed and I can practically see a link there. But theoretically I am still unaware as to how remaining equanimous to body sensations has anything to do with the deepest habit patterns of the mind. Now my question is if one stops Vipassana meditation for a sufficient period of time. Is there a way for these sankharas to develop again?