Assuming this year goes well, Hillary is President, etc. What does 2020 look like? I imagine the anti-Obama crowd will continue beating the same drum they have for the last 8 years just with anti-women dogwhistles instead of racial ones, but if the GOP gets crushed this year and we follow it up with four more years of competent governance, who can they nominate that stands a chance in 2020? I honestly think the GOP establishment needs Trump to take the fall this year if they want to regain their party. The crazy wing needs to take a big loss, a big direct hit, if they are going to shut up. If they steal the nomination from Trump and still lose in November, that just means that the party will keep pushing for a 'true' conservative.
I'm not saying that Trump losing this year helps them to be a nationally relevant party in 2020, because I don't see how they bounce back from this year that quickly, but I do think the Tea Party needs to get dashed upon the rocks in a national election, rather than the GOP Convention in order for them to fade away.
My dumbdumb predictions for 2020 is that if they nominate Kasich or someone of his ilk in place of Cruz or Trump this year, they'll just be back in four years... Or even better, they'll get a Palin, Bachman or a Fiorina in
2020 to try and sway women. I think that if they let Trump or Cruz take their shot at it, then they'll be able to safely go back to Romney-esque types in 2020, and that the time might finally be right for a boring moderate Republican to appeal to swing voters.
That said, I think Hillary will fill Obama's shoes nicely and that the country continues gradually shift left after 12 years of solid Democratic leadership.