If the election is stolen in favor of Trump and the courts rule in his favor, do the Democrats just quietly hand over the keys?

Though that’s somewhat irrelevant to the OP. There are plenty of discussion of whether that is likely/possible elsewhere

The question here is what to do if that happens?

One thought I had. Would the Democrats be able to expand the SCOTUS after the fact and then rebring the case between election and the inauguration? It would be the hail-iest of hail Marys but whats the alternative, taking to the streets?