Earthcrust plates which have crossed equator will never reurn to Equator

 

Yes
That is what I am trying to say.Some of theories says that ,the south pole plate (Antartic plate)will now move towards North. Ultimately one more super continent will be formed.
  What I am trying to say that ,the Pengea was the first and last of super continent.
Plates doesn't move hapzardly nor do they move due to heat currents. So once broken supercontinent Pengea will never reassemble at one place. Also the plates which have crossed equator and moving towards North or south pole will never return to equator
All plates will try to move towards poles.
Above Equator plates will move towards North pole and below Equator plates will move towards South pole.
The speed of movement will reduce as they approach poles and may become stand still at poles .
Supposing if the pengea was broken down by Heat currents ,there are few questions to be answered
1) Whether that heat current was present ,while pengea was forming?
2) If yes ,the spillting force of heat currents would not have allowed the pengea to be formed at that place.
3) If the heat currents started later ,why and how.
4) Whether these heat currents changes location over millions of year