I think the OP may need to put a little less "conspiracy sugar" in his morning coffee.
The "big institutions" can create all the blockchains they want with all the taxes and government oversight they want... and the various governments of the world can do the same... and everyone can feel free to ignore them and continue using Bitcoin (or whatever new and improved cryptocurrency that comes along) that remains decentralised and without the taxes etc.
While I don't agree with everything OP says there are some things I do agree with him on, and this is not one of those things.
Voluntary taxation would have to immediately go to forced taxation if it was to ever get that far, mostly due to the fact that no-one would voluntarily be taxed on their Bitcoin and most people would just ignore it. A "Fed-coin" that could spring up would also likely be ignored by a majority of people because everyone already has other forms of digital banking, and this means that unless a "Fed-coin" was pushed and required as the only form of payment (which would be viewed as a detriment and probably in a poor manner to anyone who was already a part of the previous financial system), there is no reason for a Fed-coin to exist, because no-one would use it.