There is no command.
Jesus never gave commands of anything. Just because Paul told people in Corith about it, does not make it something continuous.
This was to the disciples around him and with him at that time.
Really, no one has received benefits of this passover. God has not passed over our sins. And if the passover is the same as the angels destroying at armageddon, then it is something to be done after that time.
My conclusion is that it is for the 11 to have kept doing in remembrance of him. No one today ever knew Jesus so there is nothing to remember.