I get Arizona and Georgia turning to Lean D and Texas becoming a swing state again, but I've seen more than one person show Connecticut and sometimes Rhode Island becoming Republican again by about 2044 on average. Why is this?
The GOP likely moderates on social issues. Examples: moderately pro-life on abortion, but doesn't take an "Every sperm is sacred" approach; gives up on opposing LGBT rights; supports weed legalization, etc. The Northeast is secularizing at a rapid rate, and I could see Christians being a minority in New England by the 2050s. The GOP would HAVE to adapt to such a demographic reality by that point.
Economically, they support policies that don't hurt white-collar suburban voters and have a more fiscally disciplined policy.
Their foreign policy would likely be somewhere in the middle between Ron Paul and Bill Kristol.