Mountain Bikes (or lack thereof)...

I thought it would be interesting to hear the opinions of the people that actually matter
More and more these days (particularly in Kingborough where I live), signs are going up everywhere banning cycling on trails that had previously been used for decades (for instance, the Alum Cliffs track).
One particular sign (yes, a proper sign!) on another track prompted me to start this topic; it states: "Push bikes damage the bush. No cycling beyond this point".
So my questions for you all are;
Do push bikes and therefore cyclists damage the bush?
Should cyclists be banned from more of our tracks?
Should the bush be only available to walkers?

More and more these days (particularly in Kingborough where I live), signs are going up everywhere banning cycling on trails that had previously been used for decades (for instance, the Alum Cliffs track).
One particular sign (yes, a proper sign!) on another track prompted me to start this topic; it states: "Push bikes damage the bush. No cycling beyond this point".
So my questions for you all are;
Do push bikes and therefore cyclists damage the bush?
Should cyclists be banned from more of our tracks?
Should the bush be only available to walkers?