Right, so no one here has read the law in its entirety so we cannot tell you precisely what will happen in the future. Implementation has been a big issue with the ACA and its future impacts are very nebulous right now. No one knows EXACTLY what will happen. We do know more people will be covered, and that is about it for sure.
The ACA has some main goals that I will outline here:
i. Everyone should have health insurance:
Logic: Healthcare is a human and civil right afforded to every one in this country and everyone should have access to it without fear of being able to afford it.
Implementation: Government "waves" a magic wand and says that everyone is covered (essentially they create a marketplace where no one could be denied health insurance thanks to the options available). Add a penalty for those refusing to have health insurance in order to avoid the pressure on the system that the uninsured place on it.
ii. Throw money at the system to pay for the currently uninsured and insuring them.
Logic: The government should have a role in paying for what it believes is a basic right.
Implementation: Expansion of government insurance programs and funding for the currently uninsured.
iii. Expand the health care workforce
Logic: We need more health care providers to take care of all of these people.
Implementation: subsidize medical education and mid-level provider education to increase the health care workforce
iv. Emphasize and expand access to primary care and preventative medicine.
Logic: If we catch problems earlier we can fix them more easily, painlessly, and cheaply than if we attack them once they grow in severity. (See: diabetes, hypertension, stds, etc.)
Implementation: Public health initiatives to increase awareness and access to preventative care. Incentivize primary care physicians with financial incentives. (For more info on how "preventative care" can work or not work see China's PCP policy where physicians are paid if their patients are not sick, citation needed)
v. Decrease non-compliance and medical errors.
Logic: We lose an estimated 100-300 billion dollars every year to errors, extra care due to non-compliance, and other inefficiencies. Let's fix this.
(citation for this very large 100-300 billion $ figure - CDC 2013 - definitely worth a skim, there's a lot of good data here as to where these losses come from and why they might arise, also read
@DubVille 's post below)
Implementation: ???? Who knows? Create incentives for physicians based on "performance". Very hazy here, I'm not very sure myself. (read DubVille's post below for more info)
There's a lot of other parts to this law but thats what I remember from the top of my head when I saw a presentation on it at our Uni's law school.
For a very educational and short explanation of what health reform is doing and what it means right now, click
here. - Kaiser Family Foundation, 2010
As a rule, if something affects insurance companies then it affects physicians. Insurance companies are the parasitic medusas on our chest that we can't live without.
EDITS: added citations, links, and bolded/italicized for clarity.