As a 20 year old born in 1994, I personally lean towards the growing Libertarian wing within the GOP, and I also know several other people in my age group who are also leaning in that direction. On the other hand, I live in suburban Georgia, which is currently a GOP stronghold as is.
Nationally, I agree that those born after 1993 will be more pro-GOP than the 1982 - 1992 crowd. However, the Republicans must become moderate to liberal on social issues. People in my age group are less keen about the Democrat Party's view on fiscal matters, but we're as socially liberal as those who were born in the 80's. An evangelical, socially conservative GOP cannot survive.
That doesn't mean it will try. Or maybe the Republican party will do well this year only to get its butt kicked in 2016, by 2020, they will have established a dynasty in Congress and will have won with a moderate conservative who oversteps and loses congress and is forced to be pushed to the center. Hey. It could happen.
This is all speculation on my part. For all we know, young people could suddenly become more socially conservative due to a string of events or one singular event. (Look at how people are becoming more interventionist thanks to this whole ISIS ordeal.) All I can do is speculate with the data that currently exists. But I do agree the GOP will have to change on some issues.