The Native peoples are a factor that requires careful thought in this scenario, for sure their fate might well be quite different if the reservations and things like Oklahoma aren't founded or if the different successor states pursue different responses.
Perhaps South Carolina gets swallowed up by Georgia eventually then? I don't know, there are such a lot of black slaves there, might make forming a state impossible, to say nothing of the point made above about the lack of breadth in their economy. Total reliance on cash-crops does not a healthy economy grow.
We are presuming everybody remains on good terms with each other yes? Instead of border skirmishing? Vermont might survive as a buffer state between New York and New England both competing against each other, but it's tough to see other-wise as I have said. I'd actually think it more likely that one state consolidates and after a few years, conquers the whole thing to secure their position on the continent. Perhaps ethnic tensions or religious divisions between different majority and minority groups, such as Dissenters versus Anglicans versus Catholics become an issue? Pennslyvania probably has a lot of Anglicans and Dissenters, but will also rule over Catholics in Maryland. How does that work? Yes, they would expand along the Delaware Valley, but in a world where we have the US not being able to hold themselves together based on shared ideals, local culture becomes more important, if only to establish a shared culture over a settler culture. Balancing the interests of these two groups will be difficult. States, where there is a much higher population of German-born or Irish-born people, could end up acting out their homeland's biases and prejudices in each new country's relations with each other and having problems with states with people born mostly in England or Presbyterian Scots/Ulstermen. Let us all remember, this isn't relations between US States, this is relations between foreign nations now. All men are created equal only as long as you wish it to be so, they didn't exactly apply that principle universally did they?