Not sure where they would reverse it. The story is that if Pluto is defined as a planet the current definition of a planet has to be changed.

Specifically the line "A planet is any object in orbit around the Sun that is dominant in its immediate neighbourhood.". This happens due to big objects making small objects orbit unstable if they are close. Pluto does not do this and does not fill that criteria.

If this criteria was removed however there is a lot of additional bodies in orbit around the sun that would be planets, so it's Pluto and 200 additional planets, or Pluto as a dwarf planet.