Mr Mandelson and Mr Bayley were interviewed separately on BBC Radio 4's Today programme.
Mr Bayley also said there was something "troubling" about the style of the politics involved in the project.
Adrian Bayley, who is from the suburb of Coburg, appeared at Melbourne Magistrates Court overnight.
But Kim Bayley, director general of the Entertainment Retailers' Association said there was cause for optimism.
Kim Bayley, director of the ERA, blamed the slump on a weak year with few blockbuster hits.
Adrian Ernest Bayley, 41, has admitted murdering 29-year-old Jill Meagher on 22 September last year at Brunswick in Melbourne.
BBC: Jill Meagher: Man pleads guilty to Irish woman's murder
Ms Meagher's family was not at the Supreme Court in the state of Victoria for Bayley's appearance on Friday.
BBC: Jill Meagher: Man pleads guilty to Irish woman's murder
Mr Bayley said the Dome's proposed contents appeared to be of variable quality and singled out the controversial Mother and Child figures.
Mr Bayley said he was an enthusiast for the whole project, but quit because of the way its creative element was being directed.
"It is very unlikely that new major employers can be attracted into Caia Park, " said Steve Bayley from Wrexham Council.
Ray Bayley, the founder of Novus Law, another outsourcing firm, says that his industry is not just about paying lawyers less.
Design critic and cultural commentator Stephen Bayley agrees that the use of "low-tech" Post-it notes is significant as "the robbers abused sophisticated smartphones".
He said the Meagher family had been "spared the anguish" of a high profile trial because of the change of plea by Bayley.
BBC: Jill Meagher: Man pleads guilty to Irish woman's murder
Era secretary general Kim Bayley said "most retailers" will follow HMV's lead, but argues that singles will not die out as a physical format.
BBC: NEWS | Entertainment | HMV drops official singles chart
Mr Bayley is not a lawyer he spent much of his career at PWC, an accountancy and consulting firm, figuring out how to make companies leaner.
Labour's Hugh Bayley asked what the government was doing to improve security in Somalia, telling MPs that the political situation in the country had made the famine worse.
Clive Bayley is a cool, greedy Daland, and Susanna Tudor-Thomas's Mary displays dramatic skills that help untangle the resetting of the spinning scene to a factory that makes what else?
WSJ: Review: Saving a Sinking Ship | 'Flying Dutchman' at the English National Opera
The issue was raised again during business questions on 2 February 2012, as Labour MP Hugh Bayley urged the government to commit to bring forward its own bill on the subject.
Signatories to the backbench motion included Labour's Fabian Hamilton and Hugh Bayley, Conservative former minister Sir Peter Bottomley, Lib Dem Julian Huppert, the SNP's Pete Wishart and Green MP Caroline Lucas.
The Labour MP for York Central, Hugh Bayley, and the Conservative MP for York Outer, Julian Sturdy said they would press for a Parliamentary debate on how they claim the county "loses out" due to the national funding formula.
Before Prime Minister Tony Blair could even open his mouth to reveal the secrets of Britain's biggest mystery, the public spat between the minister in charge of the Dome project, Peter Mandelson, and its former creative director Stephen Bayley re-ignited on the airwaves.
应用推荐