Is this just a lot of political hot air voiced by leaders of both parties? Will the Republican Senators hold their ground or cave in at the last minute?

Democrats Outraged After "Unprecedented" Decision By GOP To Deny Obama Supreme Court Nominee Hearings
Zero Hedge
Feb 23, 2016
http://bit.ly/21eop76

[snip]

The war between Obama and the Republican Party over Scalia's Supreme Court replacement just went nuclear.

One day after a 1992 video clip emerged of vice president Joe Biden emerged when the then-senator from Delaware said the Senate should not consider a Supreme Court nominee by president George H.W. Bush during an election year, this afternoon Senate Republicans went "all in" on a Supreme Court gamble, in which they vowed to deny holding confirmation hearings for any nominee from President Obama.

The unprecedented decision, made before the president has named a nominee, marks a new chapter in Washington’s war over judicial nominations according to The Hill. In a battle of superlatives, CNN adds that the "historic move outraged Democrats and injected Supreme Court politics into the center of an already tense battle for the White House."

"I don't know how many times we need to keep saying this: The Judiciary Committee has unanimously recommended to me that there be no hearing. I've said repeatedly and I'm now confident that my conference agrees that this decision ought to be made by the next president, whoever is elected," Senate Majority Leader Mitch McConnell said Tuesday.