You just explained away your own sacrament. Look how easy it is to cancel something with one's own interpretation of Scripture.How do you know? Were you there?
But wait--! Which cup Jesus gave in His Last Supper is your communion cup based upon?
He gave thanks for both cups. Sounds like consecration to me.
But lookee here what Matthew 26 says about the Last Supper:
So, even the cup that is "my blood of the covenant" Jesus called "the fruit of the vine."
Ergo, the wine in communion is still wine. Simple.