Louisiana Wetland/Solid land border

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We know about coastal erosion, but is there such a boundary where this would end and the marshes would meet solid land?

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Eh, yes and no. It's different depending on which side of the state you are on.

The Chenier Plain (western coast) is much older, and therefore more stable, than the Deltaic Plain (eastern coast). The change from wetland to "solid" land is going to be much more obvious in southeast Louisiana than southwest. The unstable nature of the Deltaic Plain is why erosion/subsidence is a bigger issue there than in the Chenier Plain.

I've worked for the majority of career in wetlands. There are some fairly obvious transitions from Marsh to prairie/pasture/developed land. But it isn't necessarily unstable to stable. Some mineral marshes have very hard bottoms, as hard as the prairies they transition to. The difference is just flood frequency.