Your union sounds like a federal reserve system not a union.
Chomsky on Federal ReserveWe already have significant amounts of hashing power in a few hands and any 'union' would act in their own selfish interests and if they could adjust the price of BTC they would.
They 'un'-fortunately do not have the resources just to HOLD back bitcoin as they have significant investment in the equipment and space in which they operate.
If they could manipulate the price they would, ala Mt. GOX, without having to form a 'union' there are greater powers at work who moderate the price of bitcoin.
Careful what you wish for there is already a club for those who have the majority of the bitcoins...
http://blogs.wsj.com/moneybeat/2015/06/02/bitbeat-grand-plans-for-bitcoin-from-necker-island/One half of BitBeat spent last week moderating discussions at the inaugural
Blockchain Summit on Richard Branson’s Caribbean island, Necker Island.
It was perhaps inevitable that an exclusive event in a tropical idyll, where
businessmen hobnob in the presence of one of the world’s richest men, would
elicit allegations of elitism from some of quarters of the bitcoin community
(as well as the occasional conspiracy theory.) But as the summit progressed,
it became clear that the attendees had grander and, arguably, more altruistic
aspirations than their critics imagined.
The group, which the summit web site described as comprising
“the greatest minds in digital innovation,” explored multiple projects
that would use the blockchain – the core ledger technology underlying
bitcoin – to change the lives of billions of people. Whether these succeed
remains to be seen, but the scope of the goals discussed was striking.
The same people who control fiat are discussing things with the people who have majority control over bitcoins on the planet. You tell me if that is a good thing. Front and center at the table is Bitfury... so much for your union.