You seem to accept that SS and Medicare will collapse...why? Why couldn't we simply raise taxes to cover increased expense? Now this might not be the ideal solution, I hardly think it means the system is a failure or that it will fail.
Rising medical costs is a problem but the GOP doesn't focus on medical costs because they are in the pocket of the insurance industry and healthcare. Frist's hospital chain is an example. Addtionally, the right backs the drug companies when they lobby for keeping a closed market, which happens to be contrary to their central "great tenet" of economics: free trade.
I think the problem is that you think there is a problem. The right has always been against the graduated income tax, social security, medicare, the Dept of Education(Dole's 96 GOP wanted it abolished,) and most all social welfare spending. The problem is that their message has convinced you these institutions and programs need fixing...it's a the same old story.
The GOP casts the government as evil in order to shift the tax burden from the corps and investors.
Here is more info on the Social Security problem: http://www.ssa.gov/OACT/TR/TR04/index.html