The American flag will look exactly the same as it does now.
While unlikely, Puerto Rican statehood within four years is not out of the question, especially if deficit cutting causes the Federal government to cut back on the benefits that it send to Puerto Rico as a Commonwealth. A good deal of the support for the status quo in Puerto Rico is due to the perception that Statehood would hurt the island economically. If that perception is removed, I think a Statehood referendum would pass, and both the Democrats and the Republicans are on record as supporting Puerto Rican Statehood if they ask for it.
I doubt that would still go for the GOP today.
It would for the leadership as they can read the demographic writing on the wall. Blocking Puerto Rican statehood would lose any chance to win the Hispanic vote for years to come. While there would no doubt be some who vote against it, there would be a majority of the Republicans and probably all of the Democrats voting to admit Puerto Rico after a decisive Statehood referendum passed. The only roadblock I would expect the GOP to place would be to not push for a referendum, but if sentiment shifts considerable on the island in favor of Statehood, the Puerto Ricans will hold a referendum even with out Federal prodding.
