I think that the concept has potential. You could mine your base in TC and RM to prevent the enemy from pushing, and you could mine around the splat zone after an ace to surprise the enemy when they try to re-capture the zone after respawning. Obviously, the detonation timemer has to be buffed significantly for this to be any good.
I think that it could work if you could plant mines by throwing them like bombs, so that they can be planted in enemy ink. The main reason why ink mines are so laughably bad is because they are way too easy to detect and eliminate by spraying ink over them. If you could place them in enemy ink, there would be no reason to spray ink there, so the mines could actually catch enemies by surprise. Might be OP though, and it might make Suction bombs redundant.