Sober, drunk or stoned Boehner is correct.
Agree. The "Trump Party" shares some things in common with traditional Republicanism, but on other issues - such as trade and entitlement reform - it is fundamentally different. Like any populist party, it seeks to keep the goodies going for its constituency, and won't tackle such things as deficits and runaway spending.
Is a third party the answer, or are traditional Republicans content to being the minority in a populist party? Obviously, one currently unknowable factor is whether a populist party can continue to win elections, or whether the Trump victory in 2016 was unique and unrepeatable. One thing is certain - traditional Republicans no longer come close to commanding a majority, and so have to partner with others. But who? Conservatives who champion social issues? Trump-style populists who champion nativism and alt-right racism? Moderate Dems and libertarians who share traditional Republicans' goals of economic growth, full employment and entitlement reform, even though they may be more socially liberal than the average Republican?
This will all crystallize if, as I believe will be the case, President Trump declines to run for re-election. And if he does run, the presence of a "centrist" third party, as Bobby Jindal has written, may be crucial to Trump's (and populism's) continued success.