is it considered okay because congress acted in good faith on the presumption of constitutionality?

The individual mandate is a material part of the legislation, however, and so it is likely that the individual coverage portions of ACA would be changed.

Congress could choose to let the bill go into effect and just see what happens, because it is not at all clear that the revenue portions will work as designed anyway, depending on actual costs of health insurance. The estimated insurance payments now seem low, and CBO kind of messed on up on the income effect. They scored an increase in federal taxes for the non-deductibility of higher premium insurances, and the extra wages they think people are going to get (which isn't going to happen in this environment), but they forgot to deduct for the ledge effect for older self-employeds. That's pretty massive.

So it's up in the air.