Sure, but I’m not sure why. What is more fair about making DC become a part of Maryland, having it be absorbed into a state it was never a part of? Why shouldn’t isn’t the fair thing to do to treat it like any other unincorporated territory of the United States, making it into a territory?
We even already have precedent that it should be treated like a state. For the purposes of the Electoral College, it acts like it has two senators and one representative, just like a small state.
Plus, there’s the fact that the current system was designed in such a way to favor more rural states, so allowing a small urban state adds more balance–making it more fair. Then there’s how the current system requires Democrats to outperform the Republicans by 2% or so to win the presidency–which is unfair.
Then you talk about how you think it would be more fair to combine some states, which is you admitting the current system is unfairly biased. So why not fix that by biasing it the other way a bit?
To me, it definitely seems like there are much better arguments that making DC a state actually makes things more fair, not less.