As I recall, your original claim was that it would be possible for 'any kid with a laptop' to effectively remove the 21M bitcoin cap. This is NOT an example of that happening.
After a hard fork, as long as both branches survive, there are twice as many bitcoins around. If you had 100 BTC before the fork, then after the fork you have 100 "Series A" BTC and 100 "Series B" BTC.
As I clearly said every time, whether people bother to mine and use each Series is a political and marketing qestion. There is no technical obstacle to both series of bitcoins surviving and retaining some value (but quite likely their combined total value will be no greater than what the "Series A" were worth before the fork).
At the last hard fork, everyone agreed to abandon the "Series A" bitcoins and use only the "Series B" ones. If we have another hard fork to increase the block size, some people seem to be willing stay on the "Series A" branch. I don't know what will happen, but, agan, it will be decided by political processes, not by technical mechanisms.
Do you really not understand that when you say 'series A bitcoin' and 'series B bitcoin', you are really saying 'bitcoin', and 'some altcoin'?
It's true that you will have a free supply of 100 units of the alt coin, which may or may not retain value over time, depending on whether anyone continues to mine it - but you will still only have 100 bitcoins - whichever branch eventually establishes itself as the 'real' bitcoin.