Rek'Sai tunnels

I honestly believe that Rek'Sai's tunnels should be in one of 2 ways

1. Last forever but can be seen and destroyed
2. Like teemo shrooms but they have a time limit and limited count of tunnels

This way it could help for the actual setting up of tunnels and they could still be destroyed in the 2nd one if seen by true vision. What are all of your thoughts on this?