I don't think that forks of Bitcoin make any difference to the issuance, at least not an inflationary difference.But long term I don't want the 21 million limit touched, and with Bitcoin cash and Bitcoin both coexisting we have doubled the issuance.
That the limit is 21 million is arbitrary. It could as well have been any other number. The significance of a limit is to protect holders against dilution.
When the chain forked between Bitcoin and Bitcoin Cash, existing holders did not suffer a dilution. What happened was that, for existing holders, Bitcoin's single strand became a twine consisting of two strands.
Bitcoin Cash is an insurance for Bitcoin holders because it offers the possibility of sustaining the bitcoin project in the event the Segwit strand fails. Similarly the Segwit2X fork will either completely replace the existing Segwit chain or else create a third strand in Bitcoin's twine, an insurance against Segwit1X failure: whichever happens existing holdings will not be diluted, although those who hold only Bitcoin Cash are competitively at risk from a stronger Segwit chain.
Forking from the same source, the various Bitcoin chains represent different strands (dimensions) of the original 21 million Bitcoin universe ... Bitcoin string theory, perhaps.
While the different Bitcoin chains are in competition with each other, Bitcoin users can treat them as complementary.
It is not obvious to me that it is better for the twine to revert to a single strand.
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It would make life simpler, but as you say, Bitcoin was co-opted; it looks to me as if the events of the last few years suggest Bitcoin needs a highly competitive environment to keep it pure.of course, like you, i would love for there to be a single bitcoin, and for it to be massively dominant.