If Democrats win back the Senate and Republicans filibuster, we have the ability to use the nuclear option. If the Republicans are planning to continue their obstructionism and prevent a Democrat from nominating ANYONE to the Supreme Court (unless they are ultra right wing) then we should absolutely pull the trigger on the nuclear option.
Republicans have their compromise right now in Garland. They have rejected him by not having a hearing. Their obstructionism should NOT be rewarded. Garland's nomination should be withdrawn right now, and Clinton should nominate someone FAR left to replace Scalia--this is the price the Republicans must pay for their obstructionism. There needs to be a cost associated with this.
Right now, the Republican plan is to obstruct Garland until they know the results of the election. If Trump loses--or it is clear that Trump will lose--they will move to confirm Garland, as he is the best they will be able to get out of a Democratic administration. He is center-right. If Trump wins then they will block Garland, and have Trump pick the nominee that they want to replace Scalia.
That is their plan. They want to have their cake and eat it too. If it is clear that they are going to lose the Senate, they are going to move even faster to confirm Garland.
Republicans MUST NOT be rewarded for their obstructionism. It is like paying ransome to hostage takers. It encourages people to keep taking hostages because it is profitable to do so. We must do everything in our power to make Republican obstructionism painful to them--they must always have some painful price to pay for doing it. That is how you end it.
By removing Garland from consideration, and by allowing Clinton to nominate someone who is reasonably young and on the far left, it will be painful to the Republican party. They will realize that they should have taken the compromise nominee when they had the chance. If they try and filibuster a Hillary nominee, then pull the trigger on the nuclear option, and blow up the process.