Increase List of Spawns Dynamically

Hello, I've been using some code (which I take no credit for using) which spawns enemies at set spawn points, at set intervals.

I have now included "blockages" to parts of the map. Meaning the player must remove them if they want to advance to a new part of the map.

Now I was hoping to make Spawn Points become "active" or "enabled" as the player removes these blockages. Pretty much like Call Of Duty: Zombies.

A huge thanks in advance if you can help me.

P.S: This is the spawning code that I have currently. using UnityEngine; using System.Collections;

 public class SpawnWaveGenerator : MonoBehaviour
 {
 
     [System.Serializable]
     public class enemy
     {
         public string name;
         public GameObject prefab;
         public float chance;
         public float delayTime;
     }
 
     public Transform[] points;
     public enemy[] enemies;
     public int SpawnTimer;
 
     enemy chosenEnemy;
 
     float random;
     float cumulative;
 
     void Start()
     {
         SpawnTimer = 0;
     }
 
     void Update()
     {
         SpawnTimer = SpawnTimer + 1;
         if (SpawnTimer >= 100)
         {
             SpawnRandom();
             SpawnTimer = 0;
         }
     }
 
     void SpawnRandom()
     {
         random = Random.value;
         cumulative = 0f;
 
         for (int i = 0; i < enemies.Length; i++)
         {
             cumulative += enemies[i].chance;
             if (random < cumulative && Time.time >= enemies[i].delayTime)
             {
                 chosenEnemy = enemies[i];
                 break;
             }
         }
 
         Instantiate(chosenEnemy.prefab, points[Random.Range(0, points.Length)].position, points[Random.Range(0, points.Length)].rotation);
     }
 }