The 1968 election was not about Medicare or Social Security. The 2012 election will not be about healthcare.
No election is about any one thing.
Do not forget that you may not have predictive powers. A lot of really smart people on both sides of the aisle thought Iraq was going to be number one the most important issue in 2008 before the financial crisis hit. McCain thought it was his greatest liability and Obama certainly planned his campaign on it. Ended up being the economy.
If the Republicans are right, and they have to think they are, the current plan will be so destructive and oppressive and freedom-stealing that it will stay in the news and the public consciousness. Who knows? It could have a big impact in the primary and little impact in the general like Iraq was.