If sales are low, you're asking TX to essentially work for free. That's unrealistic. It's why Gateway died.Breaking 7.x appears to actually have been relatively easy, but the specific exploit is hoarded to prevent Nintendo patching it.
It might not be in their skill set and any hackers will the skills could refuse to sell them an exploit.
Flat sales could be because of lack of 7.x support, it's not in itself a reason to stop development. Or it could be the ipatch issue, as new Switch users won't buy SX OS.
I didn't say soon, there will come a time when nobody cares about atmosphere anymore.