In short, having
New Mangocoin vs
Old Mangocoin, by name, in facts does not even need to change a thing in the database files.
It is simply a matter of
how it is displayed and
how it is called. Therefore, it would look more just like this
Total: http://htxp://www.picgifs.com/generated/namegen/55d90aedc1bd9.gif *This is new Mangocoin; this is the same as 125.00 old Mangocoins.Or anythings to that effect.

6 months- one year after the change and upgrades by the whole community, the footnote would be probably no longer necessary.

as soon as this change occurs there would be a massive dump on standing orders on exchanges, inflating the number of coins in this manner not a trivial thing. Do people really want to own 1000NewMangos at 0.0000003BTC instead of 1 MCZ at 0.0003BTC ? and we do have this thing called decimals, what wrong with owning 0.5 MCZ if in future it trades for 0.004 or $2?
the purpose of this change seems to be to satisfy a demand for to own "more" coins like how a government/central bank would by issuing more but decreasing the power of each coin

why would you want intentionally resist a higher demand for your current MCZ and the result of a increased price/exchange rate for them?

whatever happens exchanges would need to informed in advanced so markets can be frozen and orderbooks cleared, it would be terrible for mangocoinz if someone accidently bought NewMCZ at the old price.
I agree 100% decimals and use terminology for the new decimals. JuSt like bitcoin has a satoshi.