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This is no guarantee. Sure the changes are voted but that doesn't make them unanimous. In theory there could always be a chain split.
It is very unlikely of course
The decred code was written to make impossible a chain split.
When a hardfork voting happens the old blockchain "dies" instantly.
It's impossible for someone to take control and keep it alive as happened with ETH/ETC and BTC/BCH
watch me fork your coin what you are saying is impossible unless it's rigged and not even an open source project..errrr yeah :\
it is obvious that the coin can be cloned like any other, just copy and paste the code
The question was another.
It was about a split in blockchain as happened with eth / etc.
This is impossible in decred because the blockchain stops working without POS voting that will always be directed to only one chain.