There just isn't the market for it.
They did have a few more routes out of HUY and more rotations years ago in the Jetstream 32 days.
They were never near 100% load factor. I presume when they got shot of the JS32's then the J41 was just way to big to support them.
And now there are less oil workers positioning and do so less often to save costs the routes can't be supported.