The number of votes it will require in the Senate to repeal Obamacare will be determined by Senate rules. The Senate rules are whatever the Senate says the Senate rules are.
Step 1: Get GOP control of the Senate.
Step 2: Have the GOP Senate caucus pass a bill repealing Obamacare.
The details can and will be worked out by the GOP Senate caucus once they have the majority.
The ‘Rats did not let any previously-existing rules stop the adoption of Obamacare.
There is no reason the GOP should let any previously-existing Senate rules stop the repeal of Obamacare.
People need to wake the heck up.