If Kavanagh is confirmed, the political fallout may cost the Republicans some House seats, and even control of the Senate. But the possible consequences, not only for reproductive rights but also for the environment and any hope of a rebirth of unions would likely be catastrophic, for a good deal longer than I for one can hope to live.
There is an alternative, other than the States' Rights option discussed here a while back. A simple majority in both houses plus the presidency is sufficient to alter the size of the court. Congress has done this six or seven times in the past, although not in the 20th or 21st centuries.
The time has come to think about serious steps, of the sort that senior Democrats are quite obviously unwilling to consider.