[Taeolas]

It may be as simple as just knowing that a stronger French community existed nearby, even if the media didn't affect it yet, gave them the durability to last, whereas the NS Gaelic community had no one else nearby, so they had/have to endure by themselves (at least until recently; nowadays they can more easily tap into their Scottish roots for support).

Even if the NS Acadians didn't have much contact with Quebec or NB Acadians, they knew they existed. Visitors in all directions would happen. Quebec would still be in the national media, even if it wasn't French, and so forth. It would make it easier for them to feel their roots and keep their culture among the wave of English that is Nova Scotia, even if it is mostly felt subconsciously.

Or at least that would be my guess for it.