Gallacher, who represents the Scarlets, Ospreys, Blues and Dragons, admitted on BBC Sport Wales'
The Back Page programme
that "there are massive hurdles to climb" to achieve that aim.
He also stated the sport's Professional Regional Game Board (PRGB) - established in late 2012, representing the WRU and regions - has yet to meet.
The WRU says the regions attempted to "amend" the PRGB's founding principles in early 2013 and the governing body says it has presented a fresh proposal for a PRGB and is awaiting the regions' response.
The WRU says it funds the regions to secure player release for Wales duties with a sum in excess of £6m, split between the four regions annually as part of a yearly £15m total.
"It is important to note that the WRU seeks to help the regions create long-term rugby and business sustainability," added the statement.
"Demands for more money do not address the fundamental problems."
On Saturday, 30 March the WRU hosted the first regional double-header at the Millennium Stadium in which Cardiff Blues and Newport Gwent Dragons forfeited home advantage.
The Blues lost
to the Ospreys while the Dragons succumbed
to the Scarlets.
However, the WRU says the Blues and Dragons will have profited off the field on a day when more than 36,000 fans turned up for an event that was marketed as 'Judgement Day'.
The WRU says it has underwritten the event's costs for a further three years and offered to host other "major events" involving the regions at the Cardiff city centre venue.
"This initiative was first proposed to the regions by the WRU in 2007," said the governing body.
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