The title you indicated and the description that was said for fiat contradicts.
We would love to call this a misleading title.

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So my fear is the government taking over the blockchain technology.
In conclusion, what will happen if the government takes over the blockchain technology and also the future of the lightning network to bitcoin?
Can we identify that the government really wants to do it ?
Blockchain is a decentralized, distributed and public digital ledger that is used to record transactions on many computers so that these records cant be changed retroactively without changing all subsequent blocks and consensus in the network.
1. Basically, I dont think that the government can take over this decentralized technology but they can still adopt technology based on needs.