God, no. The games already take TOO LONG to reach a conclusion!
I mean, the intention was to have evenly matched teams beat each other in 15-25 minutes, and unevenly matched teams to have games last 10-15 minutes.
The permanent destruction of a tower is a permanent incursion into enemy territory. If you want to make up for this, then go to the enemies' side and destroy their tower!
If half of your towers are destroyed, and none of the enemies' are, then you should probably ultimately lose unless you can really rally and make a glorious, difficult to achieve comeback! If you can't, you should lose quickly!