In another era, agreement among analysts from leading left, center, and right-leaning think tanks over a sweeping plan to address major fiscal and social issues might carry some heft in Washington policymaking.

In today's culturally infused, party-line politics, when establishment voices particularly among the U.S. Republican party have been sidelined, perhaps not so much.

But after a yearlong debate and analysis, Brookings Institution, Bipartisan Policy Center, and American Enterprise Institute economists and analysts have still given it a shot, outlining a national "grand bargain" addressing everything from immigration and decarbonization to tax and entitlement reform.