No franchise grant shall in any way, or to any extent, impair or affect the right of the City to acquire the property of the grantee thereof either by purchase or through the exercise of the right of eminent domain, and nothing therein contained shall be construed to contract away or to codify or to abridge, either for a term or in perpetuity, the City’s right of eminent domain with respect to any grantee of a franchise under this Article.