Actually, a lot of that happened and a lot more would have happened if not for the limits put on the amount of damage he was able to do. He definitely tried (and continues to try) to destroy the right to bear arms, and if not for the NRA, conservatives and a good SCOTUS decision he would have been able to do it. We're now stuck with the disaster that is obummercare, we're stuck with at least a couple of idiot justices on the court for decades to come. The damage he has done is substantial.
Sorry, there wasn't huge damage. The economy is much better than it was when Obama took office, as are international relations; he was not trying to destroy the right to bear arms, even if he'd had things entirely his way; he made social progress that the Bush Jr. administration had tried to reverse. Obamacare (you don't have to agree with it, but please act like an adult and call it by its name) is definitely flawed, but what was the Republican solution? Oh, right, Romney had argued for the same solution, and his party had no real answer other than "not that."
She can do enormous amount of damage by virtue of being able to add de-facto lefty legislators to the SCOTUS, permanently destroying parts of this society. Has nothing to do with "the sky is falling", that's simple fact. The gop has to do whatever it can to limit the amount of damage she can do, and then come up with a better candidate than Trump in '20. That's the bottom line.
Permanently destroying parts of society how? Oh no, LGBT people, women and minorities might be treated as human beings with rights and dignity! And no, it's not simple fact. You're shrieking and howling about the end of the world because you disagree with the direction, not because you 'know' that Clinton will ruin the country. Hell, while I think Trump would be genuinely bad for the country, he wouldn't accomplish nearly as much as what he said he'd do.
Also, I don't think you'd like the candidate the Republicans would need to win in 2020. The candidate will need to be more inclusive than just about everyone who ran in the GOP primary -- that means being welcoming to women, LGBT people and minorities. It means completely ruling out gigantic border walls and blanket bans on whole religions. The next Republican president will need to comport themselves with restraint and intelligence.
Funny how you think Trump could cause real damage since you attribute all those things to him, but fail to see how illary can cause just as much damage as the incompetent corrupt criminal sexist vile liar she is. Two sides, same crappy coin.
False equivalency. Clinton actually has experience, and demonstrated competency (yes, Libya was a mess, but that's not the only thing that happened while she was Secretary of State... and remember, she was a state senator). Most of the corruption allegations have been dismissed as bunk. And sexist? Frankly, that's comic... she's not anti-men. She's not the one who bragged about sexual harassment and has dozens of allegations against her. And sorry, but she's far more truthful than Trump (Politifact even checked that). Trump not only tells lies throughout large portions of his speeches and debate appearances, he'll lie about having lied even when you have undeniable evidence of the original lie. Clinton is far from flawless, but I would much rather have her running the US than Trump.