Um... no.
Why? Because lets say "Dark Jeroid" was special summoned by "Monster Reborn" and there was enough extras on the field to raise his ATK to 1500 or above. Even though his effect activates automatically, the timing is still right to use "Bottomless Trap Hole" (see any ruling about using "Trap Hole", "Torrential Tribute" or "Bottomless Trap Hole" vs. a Normal Summoned "Breaker the Magical Warrior").
Just because a new chain starts, that doesn't mean the timing is off for other things to happen. You need to look at the last thing that resolved.
- A