I chose 2050s because by then Generation X Republicans will be in retirement homes instead of on the national stage and by that time they should have had a president that they think they can be proud of.
Reagan is the Republican's FDR.
Do we expect Democrats to stop talking about the strides that FDR made during his Presidency anytime soon?
That's a false equivalence, Democrats today don't namedrop FDR to show their liberal cred nearly as obsessively as Republicans do to try to bolster their image.
They're much more likely to mention Clinton, especially in relation to Dubya. Alison Lundergan Grimes even said "I'm a Clinton Democrat." while campaigning in Kentucky. FDR just doesn't have the universal appeal today that Reagan has, that ended like 20 years ago.
With Reagan you can mention his name anywhere in the U.S. and people will generally approve. Not so with FDR, Clinton has now come to occupy that vacuum he left.