Depends on what happened to the R party it's Doomed if we get Voting Rights or DC STATEHOOD
The Republican Party is in deep trouble, sure. They face a large, very hostile younger generation that sees them as culturally alien and blames them for a lot of their economic misery. They are increasingly isolated to one region of the country and even in that region, they are progressively losing more ground as the demographics....
Oh wait, sorry that's the 1930s I was talking about, wrong thread.
More seriously, part of the reason why I would love to see independent redistricting, public funding of elections and an increase in the House of Representatives, is that it would force Republicans to be better candidates at the house level and thus create a stronger bench for statewide elections. I have long argued that the current dynamic turns GOP House members into brain dead lemmings who are spoon fed talking points and then you wonder why they get destroyed in primaries for Senate by loons and extremists who then themselves get demolished in the general elections.
The addition of two seats from DC would not doom the GOP, it would just have to adapt to be able to flip seats in PA, WI and MI. Parties adapt to fit the path of least resistance to power, which is usually by absorbing whoever the ruling party intentionally or unintentionally leaves for dead alongside the road, which restores the equilibrium. Rockefeller Republicans was the GOP adapting on a broad scale to survive in a region shifting leftward socially and increasingly dominated by labor unions. If the present dynamic is not working the question is not whether the party adapts, but how many unnecessary losses does it take before it does so.