When she got her 17th #1 she said she knows people probably don't want her to come for The Beatles record of most #1 hits.
Hence why after Touch My Body became the 18th #1 and she knew the public just loved her too much she released "Bye Bye" and ruined the era instead of having "Migrate" and "I'll Be Lovin' U Long Time" follow-up.
The way these dances are created and catch on and go viral for a few months. You have to learn a new dance every 3 months to be able to punch @ the club.