From a very perceptive article at "The American Thinker" which posits that if Trump loses Bannon he loses what made him President:
No more dumb war. Voters from the ancestral regions of the Union draftees after the Civil War – from northern Maine to the Minnesota Iron Range – have, ever since, instinctively viewed war with suspicion. Study the voting patterns of this kind of county, and you will find that sudden surges turn out to oppose various wars. The heart of "isolationism" was a Midwestern phenomenon in the same regions that tilted so heavily toward Trump in the election. It is not a coincidence that areas with historic antiwar tendencies – from east Tennessee to western Wisconsin, from rural Iowa to northern Maine – were some of the biggest pro-Trump trending areas in the country, nor that two states that formed the heart of antiwar politicians in the past (like Ohio's Taft) bolted so heavily toward Trump. Trump used his war-skeptical views to outflank the war-loving Hillary on both the working-class left and right, giving him the keys to his electoral majority, heisting Bernie primary voters along the way. Betray this group with another Mideast war, and Trump endangers his electoral majority permanently. That is where Bannon's inclusion in national security decisions remained critical for Trump's own political future.
Bannon politically is to Trump what Carville was to Clinton, Atwater was to Poppy Bush, and Kevin Phillips was to Nixon, but he also enjoys a consigliere-type skill set for actual policy that gives strategic substance to Trump's gut-driven, emotive decision-making. Trump's instinctive ingenuity and persuasive mastery cannot substitute for Bannon's integration of policies and constituencies in actually governing.
Kushner's apparent deference to the war-mongering elements of the national-security establishment and the bank-adoring financiers of Wall Street reveals that he suffers from the same delusional understanding of politics and policy that got the GOP so hated by its own base over the last half-decade. Kushner looks to the approval of Goldman Sachs; Bannon looks to the approval of those who hate Goldman Sachs.
Lose Bannon, lose the country. Lose Bannon, lose the presidency. Trump needs to bet on Bannon, or it will be time to no longer bet on Trump.