Is it Reasonable to Assume our Galaxy is in a Steady State?

[mmtwwla]

How can we make the assumption that the Galaxy is approximately in a steady state at the present time?
I read this from the textbook:
"the time required to complete one orbit at 10kpc is 3×10⁸yr... a typical disk star has completed over thirty revolutions, and hence it is reasonable to assume that the Galaxy is approximately in a steady state at the present time."

 

[phinds]

How can we make the assumption that the Galaxy is approximately in a steady state at the present time?
I read this from the textbook:
"the time required to complete one orbit at 10kpc is 3×10⁸yr... a typical disk star has completed over thirty revolutions, and hence it is reasonable to assume that the Galaxy is approximately in a steady state at the present time."

So, do you think that on the 31st revolution things are going to go crazy?