I'm sure Republicans will never demonize a party boss from New York like they did with Pelosi and San Francisco.
Sure they will, but it'll take a few years for said demonization to stick. Party leaders in Congress tend to start out largely unknown, and then within a few years become really unpopular. That's why both parties should probably just swap out their leadership every four years or so (though that's probably a more pressing problem for the party that doesn't hold the White House, since the party holding the White House is always going to be more associated with the sitting president than with any particular leader in Congress).That's fine if you don't actually want to have a functioning Congress. And I don't necessarily agree anyway. Paul Ryan is very unpopular and he's been Speaker less than three years. Pelosi was only Speaker for four years and the first two were counterbalancing a very unpopular President of the opposing party. Democrats didn't lose in 2010 because of Speaker Pelosi. From what I recall, she moved a lot of legislation through that House that never got a final Senate vote, not to mention ensuring passage of the ACA. If that alone cost her the Speakership, I'm sure she can sleep well at night.
Just like President Obama cost us the House in 2010, Trump will do the same to Republicans in 2018. Midterms are all about the President. Congressional leadership only matters to staunch partisans, who already vote in every election.