Yes, Republicans will work to change, rather than repeal Obamacare. While there are a few aspects that need tweaking, Obamacare is a great program that most people agree with. It was a major feat to get it passed, taking most of Sen. Kennedy's career. No one will try to repeal the program completely, just to change some parts of it.
Republicans have a strong Obamacare repeal plan. They don’t have a strong Obamacare replace plan.Trump’s health care website promises that he will “not allow people to die on the sidewalks and the streets of our country" for lack of access to health insurance.
At the same time, Trump, like the majority of Republicans, has repeatedly called to repeal Obamacare.
No, the fact that only 25% of Americans want Obamacare will not stop the Republicans from trying to take it away from the American people. It should be evident to any experienced observer of American politics that the main goal of the Republican party is to end virtually all government programs that benefit the people, whether the people want to do this or not.
The Republicans have already decided to delay making any changes to Obamacare. They've already decided that it's going to be three years before they even vote on it. That means they don't really intend to do anything. Congress doesn't take three years to create a budget or decide to go to war.