It would be a logical move at some point for Rousey to move from the UFC to the WWE. She is already cutting WWE style promos in the UFC.
There will be a time when she runs out of opponents, gets beat or her popularity starts to wane and that would be the perfect time to jump to WWE. It is good money, especially for someone as high profile as Rousey.
According to TMZ, Rousey knows it is too late to compete in this year’s Wrestlemania, but would be open to next year’s Wrestlemania in San Francisco.