Regarding a vaccine: Despite what some people in the thread and some political figures have been saying, experts say that a vaccine for the Coronavirus is at least a year away from being available to the general public (
https://www.newsweek.com/anthony-fauci-coronavirus-vaccine-year-away-public-availability-1489214). Fastest time from outbreak to approval of a vaccine is ~ 7 months (for the 2015 Zika virus outbreak in South America,
https://www.statnews.com/2020/01/24/how-fast-biotech-vaccine-coronavirus/). While approval for a vaccine (which involves performing clinical trials to make sure that the vaccine is safe and effective) could come within a similar time frame, this does not account for the time needed to mass produce the doses required for use by the general public. Before then, access to the vaccine would likely be limited to those at the highest risk of contracting the virus (e.g. hospital workers).
SARS went away on its own because it was able to successfully be contained. Containment of SARS was easier because the symptoms were much more severe, so it was easier to detect and isolate those with the disease. COVID-19, however, is associated with much milder symptoms and it appears that asymptomatic individuals can transmit the disease (e.g. see
https://www.nejm.org/doi/full/10.1056/NEJMc2001468 and
https://jamanetwork.com/journals/jama/fullarticle/2762028). These features of the disease has made it much more difficult to detect and isolate infected individuals, allowing the disease to spread undetected in some communities (like in the current outbreak in Washington State). It is looking increasingly likely that containment methods will not be able to completely eliminate the disease.
However, while containment methods may not be able to eliminate the disease, this is not to say we should give up on efforts to contain the disease. As many in the thread have said, a major danger of the outbreak is that it could overwhelm healthcare systems when a large number of people show up to hospitals, sick and in need of treatment. Taking measures to slow the spread of the disease and limit its spread can make a big difference. For example, there would be a big difference between 60% of the population getting the disease in one month versus 40% of the population getting the disease spread over the course of 3-4 months. In the first scenario, hospitals could run out of capacity to treat patients, leading to much higher death rates.
As for the long-term outlook for the disease, STAT News published a very nice piece discussing the issue:
https://www.statnews.com/2020/02/04/two-scenarios-if-new-coronavirus-isnt-contained/