There has been a lot of discussion in the wake of the 2012 election of the need for the Republican party to alter. The general thesis has been that the Republican party needs to do more to appeal to non-white, young, and female voters. This is a correct analysis of the electoral challenge facing Republicans, but I think it overlooks the nature of political parties.
The press generally has a very candidate-centered view of political parties, and has focused on the degree to which various candidates--Bobby Jindal, Marco Rubio, Jeb Bush--can move the Republican party in a direction is more appealing to voters. This narrative represents an incorrect view of parties.
In "
The Party Decides", a quartet of political scientists make the argument that parties are actually coalitions of policy demanding groups with narrow interests. These interest groups negotiate amongst themselves and decide on a presidential nominee who is generally acceptable to all members of the party coalition. From this perspective, the Republican party can be thought of as an alliance between the social conservatives, small government conservatives, Neocons, anti-environmentalist business organizations, nativists, etc.
In the recent election cycles, nominally moderate candidates--Romney, McCain--have shifted their positions to the right on a number of issues, in order to be acceptable to these groups.
For the party to really change there would have to be a largescale realignment, effectively destroying the party as we know it, or all of the policy demanding groups would have to simultaneously ease their demands for fealty from candidates. I see no evidence of a realignment happening, and policy groups are unlikely to ease demands for two reasons. First, these groups exist for the very purpose of demanding certain policies. Second, if one group eases its demands it will effectively cede some of it's power to other groups, this creates a collective action problem within the coalition, with each group fearing that by easing its demands, the others will take advantage to gain more power within the party.
What we will see instead is a series of candidates trying to appear moderate and electable, while convincing each of the groups that makes up the Republican party that he or she (probably he) won't sell out their cause once they are in office. The potential nominees don't actually have the power to pull the party in a different direction--because they aren't the party, they are just the politicians.