It probably does become mundane for a number of people, but Jesus' command to repeat it consistently, reveals there is a divine usefulness in so doing. To not repeat it regularly would be to deny regular spiritual sustenance to those followers of Christ who draw from its sacredness. The Saviour knew how much strength participants would be able to receive from it and how it would help to deepen our relationship with Him. At times I must confess it has been mundane to me as I have just gone through the motions of partaking, but that was my stage of the journey toward Him, not that the ritual was mundane, perhaps I was mundane though!