Replacing With What?

EVERYTIME THE REPUBLICANS mention repealing Obamacare, they say "repeal and replace", rather than merely "repeal". Why? Why do they always say replace? If they think Obamacare is a disaster, which they claim they do, then they must think the health insurance system was much better before Obamacare. So why don't they advocate going back to the way it was before, by repealing Obamacare, without bothering to replace it with anything? The reason, of course, is that the republicans know very well that the American people would never stand for it. that's because most Americans like Obamacare, and don't want it repealed at all, let alone replaced. Some minor tinkering is all it needs, most people know, but the republicans, ever hatful of Obama, will not rest until they see his name erased from every building, all traces of his legacy destroyed. Obama himself suggested that republicans would embrace Obamacare if it were renamed "Reagancare" or "Trumpcare", and you know he's right? So, why not? Why not fix it, and rename it, rather then repeal it and replace it with something more free market and less effective? It is obvious that even the republicans understand that Obamacare is a vast improvement over what existed before - corporate controlled health care insurance. They may never have the chance to present replacements plans, because we the American people may never give them the chance to repeal the good system we already have, thanks to president Obama.