Lets step away from the nonsense that is ravensteven, and get back on topic. Abortion is not very likely to be overturned at all, and it is naive to think so at all. One judge being replaced does cannot guarentee the needed amount of votes to overturn a ruling. Also, Jane Roe, is now an born again Christian, pushing for the pro-life agenda. Crazy huh?
I don't see this playing out reasonably at all. George Bush has continued to show bad judgement in his decisions again and again, and with a Republican majority rule in Congress, I don't see this playing out to any interests other than conservatives. John Bolton, a constant slanderer and mocker of the UN, being nominated as US Ambassador to the UN is proof enough of this.
Democrats are actually being very reasonable about this. An agreement was made between 14 senators, 7 Democrats, and 7 Republicans, that the president would seek the advice of Congress in his nomination, and in return, Democrats will not issue a filibuster unless in case of an "extreme circumstance."
Here is an interesting article concerning the matter.
http://www.indystar.com/apps/pbcs.dll/article?AID=/20050702/NEWS06/507020490