In initial years[although I think these are initial years too] when bitcoin worth less than a $ at that point of time talking about satoshis might sound totally absurd..! but these units was defined at that time
i. 1 BTC = 1 Bitcoin
ii. 1 mBTC = 10^(-3) Bitcoin
iii. 1 μBTC = 10^(-6) Bitcoin
iv. 1 Satoshi = 10^(-8) Bitcoin
I hope someday 1satoshi will have some value...but will i'll stay alive to see that day , hmm I doubt that..
If 1 satoshi is 1$ then 1 bitcoin is 100.000.000$
If 1 satoshi is 0.01$ then 1 bitcoin is 1.000.000$
The latter could happen, maybe in 15 years