However, after T5, I think it is time to give us something more. After all, each film has set the precedent of something new for the Graboids. While I agree the lifecycle should remain set, we do need to see some variation. Or maybe some Graboid vs. (insert animal) action.
Action_Burt you have reminded me of something. Way back in 2001, right after I had watched T3 for the first time, I had thought that now the Graboid life cycle had been filled in (Grabites never occurred to me at that point.) that there should be a new take on this franchise. I figured that since Graboids and all of their incarnations had proven to be such admiral killers it was time to turn the tables on them. So I came with a predator that preys mostly on Graboids, and I called it the Dwarf-Rex.
The Idea was that a descendant or cousin of T-rex had evolved special adaptation to aid it in hunting Graboids. Because Graboids are such good hunters, and with Shriekers can reproduce so rapidly, the ecology of the regions in witch they rain would collapse completely. That is unless there was something to control their populations. So having a predator to take out the excess Graboids would be a logical expansion on the Tremors Monsterollogy. The above theory can also be used to explain why Graboid eggs stay dormant for so long.
First of all, like Graboids the D-rex eggs lay dormant for centuries. This allows it to survive the elongated periods between which its main food source repopulates itself.
The adult D-rex itself would stand approximately 12 feet high, have a huge head and next to nothing arms. Its overall shape would resample a shrieker's. This is to give the implication that it's some how connected to the Graboid even though it's not the same creature. It's colouring would be reddish in base. With darker stripes dawn it's back.
Since the T-rex had such a powerful sense of smell and that Graboids have such a powerful stink, the D-rex would hunt primarily by smell, and would retain the same vision as the T-rex. (the T-rex couldn't see shapes, only movement)
To kill Graboids, the D-rex would admit a powerful roar of such magnitude and frequency that it would first send a victim Graboid into Nero-shock, and then literally cause the Graboid's brain to explode. The D-rex also had a bony protrusion at the end of its snout witch would be used to dig up its food.
As for story; Some place in Africa would have the largest Graboid attack ever recorded. So the Army would draft Burt. Burt and a small group of scientists plus solders would lock, load and kick some Graboid tail. After it looks like they might have things under control, there would be these mysterious attacks that don't match Grab, Shrieks or ABs. Every one would be scared and confused until they finally discover what's really going on. The climax would involve several Graboids taking on a couple of D-rex's. How do you like that monster on monster action? Like I said, I thought of this a long time ago. Back when I was young and Idealistic.