If you wiped out Medicare today, the deficit would NOT go away.
What caused the deficit was:
1. The tax give aways to the uber rich.
2. Spending on the wars (which throughout history has bankrupted countries regularly).
3. The 2nd RepubliCON Great Depression (if people were working and making the same amount of money they were making before the bushes, they would be paying taxes and providing revenue for the government).
Take care of these 3 things and the deficit will practically disappear.
By the way, if we did away with the prescription drug plan that the bushes passed which does NOT allow the government to negotiate prices for medicines, Medicare would NOT be a problem.