If this were true, there would be much more antimatter in the universe than is currently observed. The idea is that since positrons can be viewed as electrons

If this were true, there would be much more antimatter in the universe than is currently observed. The idea is that since positrons can be viewed as electrons moving backwards in time, it may be the same electron weaving its way to the future and past countless times. But that would imply that the number of electrons in the universe = the number of positrons.