Yes, you should still enroll in coverage before the January 31 open enrollment deadline. When you enroll in coverage, you and the health insurance company enter into a contract that is generally binding for a year (no matter how the law changes). This means that if you enroll in coverage now then you will have coverage throughout 2017.
In case you missed it:
Yesterday, we hosted a tumblr Issue Time about the Affordable Care Act. Here’s our most popular question. You can sign up for health insurance and have it for 2017 if you sign up by tomorrow (1/31/17).