Gavra, that is very wrong. Are you saying that the Gemara, that quoted the Megillas Taanis, didn’t get it!? It takes something to argue with a Gemara.
As I pointed out on a different thread, if you read the Megillas Taanis you will see that it says that Chanuka was established because of the Ness of eight days. Then it continues to ask why the Chinuch was eight days, to which it answers that it simply took that long to repair everything.
The Ohr Zarua explains in the name of his Rebbe that the reason the Ness had to go on for eight days was because they were too busy repairing to be able to get new oil.
There is actually no reason to celebrate the repairing of the Beis Hamikdash. If anything you should celebrate the day after Chanuka.