It's a normal phenomenon that if a party loses ground and loses influence that they don't just sit back and watch everything go downhill but at some point start asking what went wrong and developing a new strategy and a new identity and bring in new people
Yeah... or they declare that everyone who isn't on their side are apostates, start running purges, rigging the voting rules at the convention to prevent the disaffected from getting power, getting smaller and smaller, causing more people to abandon them... and eventually the people who abandoned them form a new party with a different name.
This is pretty normal too. Parties can take the "reform" route or the "self-destruction" route, both are about equally common.
Anybody who pretends to be able to predict where either party will be 20 or 30 years from now might as well be reading tea leaves.
To some extent, certainly. I think I can spot a self-destructive cycle of exclusion and purges, though. The Federalists didn't recover from theirs, and the Whigs didn't recover from theirs. It's possible to recover from it, of course; the Liberals in the UK were almost completely wiped out in the mid-20th century, and they came back.
Sometimes it's actually hard to say whether a party recovered or not: the Progressive Conservatives (Tories) in Canada were completely wiped out a few elections back. The Progressive Conservatives didn't come back; they're gone; but the Conservative Party of Canada (also called Tories) came back very quickly. Different party organization, but the continuity is obvious.
Also basing electoral success on demographic change isn't a very useful tool. In the post Civil War period, most African Americans voted Republican. Today most vote Democrat. Do you want really want to predict what Latinos or African Americans will be doing politically in 40 years times?
I strongly suspect they won't be voting Republican because the party organization won't exist anymore, having shrunk itself into oblivion through repeated purges of the insufficiently doctrinaire, and hostility to most growing demographics, including, most relevantly, outright hostility to cities.
http://www.city-journal.org/2013/23_1_gop-cities.html
http://www.newgeography.com/content/003402-why-republicans-need-cities
http://www.theamericanconservative.com/republicans-wont-compete-in-cities/
What party will these demographics be voting for? No idea! Maybe the Libertarian or Conservative or Right-to-Life party, or some party which has not yet been established, will have taken over the ideological role which the Republican Party used to have. Maybe the Democratic Party will become the new right-wing party and the Greens or Working Families or some new party will be the new left-wing party. I wouldn't dare to predict. I just think I can see a self-destructive cycle when I'm looking at one.
The hostility to cities in particular is actually relevant to passenger train service, because train service works better in cities; it makes sense for a party which is openly hostile to the very concept of cities to also oppose train service. Now, there are a few small counter-examples -- the mayor of Fresno is a Republican, obviously a supporter of cities, and strongly supports passenger rail. So I'm expecting her to be chased out of the Republican Party the way Charlie Crist was -- or even the way Eric Cantor was.
More on the pattern we're watching:
http://www.outsidethebeltway.com/will-the-gop-ever-win-another-presidential-election/
Apparently the "Economist Intelligence Unit"’s index of democracies rates only Spain, Belgium, Japan, and Costa Rica as less functional than the USA, with all other democracies being more functional. This unfortunately means that the party realignment is going to be a slow, tortuous process.
Anyway, once the party realignment happens, I'm guessing we will no longer have a party which is openly and aggressively hostile to cities; it's just not a viable position to take, demographically speaking. As a result, I think the politics of passenger rail in this country will straighten itself out quite a bit.