This is one of the reasons I like bamboo. Each and every day I watch more and more of the native forest in my state get bulldozed to the ground without any difficulty. However I watched a bulldozer remove an acre of bamboo once and within one year the entire bamboo forest was back, and the developers gave up on the property
The bamboo area isn't a monoculture either because trees and native plants have returned there. It quite literally saved the forest
It makes me wonder what the complete removal of the bamboo could achieve, were it possible (and it is, but not without a lot of long term work which, unfortunately, those with the money and resources aren't likely to be willing to fund unless they can get something out of it. Like land development).
It is backwards and a bit sad that an invasive plant "saved" an area of land for native species though. I mean, when you think about it... Why can't more people care about conservation and preservation
before something comes in to shift the balance? If the only reason that area won't become developed is because it's too hard to get rid of an introduced/invasive species there, lots of things went wrong on many levels— the introduction of the bamboo in the first place was not a good thing just because it happened to play out that the bamboo makes it impossible to clear the land for development.
Did the bamboo really save that forest? How healthy and diverse would it be right now, assuming no human intervention, without that bamboo there? I'd rather humans save the environment out of care, than invasive species "save" it out of making it too difficult to do any land development there.
Basically, no, the bamboo didn't save the forest. The bamboo is likely doing damage to the forest, preventing native species from reaching their full potential. The bamboo is just another way that the forest is being destroyed, however slowly.
For like the 5th time, I urge anyone actually interested in learning about the topic and not just making baseless speculations, READ! READ about the environment, native species, how humans are destroying ecosystems by doing whatever the heck we want... Do RESEARCH! Not just brainstorming theories amongst each other and ignoring the possibilities that you personally don't like for whatever reason. And I find that reason usually is "I don't want to take responsibility".
If you read about it and find that you're wrong and that makes you uncomfortable, good. Do something about it. Make changes. I know I have. Otherwise, feel free to keep making statements and decisions based on opinion rather than scientific fact. No one can stop you.