That kind of makes me support Hillary more. If she wins the election, she can continue Obama's damage on the country to the point where Democrats will be unpopular for a very long time. Remember what happened after what Herbert Hoover did? His screw-up on the country made it bad to the point where Republicans could not gain control for 20 years. I kinda feel that this is what Trump is going to do (except he's going to make it worse even longer). The fact is, while they are more friendly on the social issues, their stands on the fiscal issues and foreign issues is their weakness. Other than the millennials, nobody in the voting population could agree that socialism is any better than capitalism. Just watch the Democrats continue destroying America. They will open more stupid issues (like the bathroom one) and continue on the dark side of political correctness (like racial quotas, censorship of history, language police, and safe spaces). That, and some of the social issues they took a stand on will implode. For example, they would start granting the right to vote to immigrants, but when abortion becomes an issue, the Dems will lose support from them.
The thing is, the support of the Republican Party, although high in some congressional elections, has been particularly low in the presidential elections since 1992.
After Bill Clinton defeated George H. W. Bush for re-election that year, the Democrats have won the popular vote in all presidential elections with the exception of the one in 2004, which was a close election, not as close as 2000, but close nonetheless. The Democratic Party has built up a lot of strength, and it will really be an uphill battle for the Republicans to climb.
The problem the Republicans had in this election was that there were too many people running in the primaries, which left only Trump, Ted Cruz, Marco Rubio, and John Kasich winning states, and Trump had built up enough support to top the other three Republicans that were left. Another thing that hurt the party was how long it took people such as Cruz to endorse Trump-he only did just today, whereas in the case of the Democratic Party, Bernie Sanders endorsed Hillary Clinton soon after the primaries ended, and although the DNC emails were soon leaked, he did agree to create an alliance with her against Trump and the Republicans, despite going back to being an independent.
While I'm not saying a Trump victory is impossible and that the Republicans will never return to power, lack of strong party unity and campaign tactics involving things such as banning people based on religion will not help. As I said, the Republican Party really needs to learn from the when Eisenhower was running for president in 1952 when he moderated the party, as well as Bill Clinton's own moderation of the Democratic Party in 1992. Why were those done? As you said, the Democrats had been in power for 20 years at the time of Eisenhower's election, and Ronald Reagan had already served two full terms and George H. W. Bush one term when Clinton was elected.