What do you mean? There's no way a Republican can keep the Democrats from getting 270 votes. They're just destroying their own party, not the political process.
To elaborate on what you all are saying, if Bernie Sanders beats Hillary, you're looking at the beginning of the end of the GOP. Trump made then lay all of their cards out, and the GOP looks to full stand for bigotry, xenophobia, and outright fascism. Both Trump and Bernie are independently made, as they don't take cash, and that is also their main draw.
Bernie will get nearly every Republican who likes Trump because he's anti-establishment (or they simply won't vote), while the GOP will fumble to find a new message as White rage will have jumped the shark. They won't be able to, imo, as they're were built off racism. They're not fiscally conservative, nor do they really believe in small govt.
Like Obama, however, if Hillary wins, she'd likely have Republicans in her cabinet too, as they eat from the same donor trough, and she wants to look like she can work with them. She would likely bring in Republican sycophants, and not Uncles like Obama did, because he wants to be considered the child genius and shyt to the adults like the little fakkit he is. So they'll be alive, and Hillary would likely do better horse trading with her concessions...but the GOP really has to keep Trump from being the nominee, which is almost impossible at this point.