Federal independent MP Tony Windsor says he is unconvinced about plans to limit poker machine use because of the proliferation of gambling alternatives for problem gamblers.
Under the latest proposal, smaller registered clubs with 15 or fewer machines have until 2018 to introduce a mixture of low-intensity machines and those featuring pre-commitment technology.
The government wanted the mandatory pre-commitment scheme - requiring gamblers to carry cards setting betting limits before playing the pokies - in place by 2014.
Mr Windsor said he remained concerned about the survival of small community clubs.
"The extension ... may well get them through for a few more years but what's it do after that," he told ABC Radio on Monday.
Mr Windsor said it wasn't worth investing a lot of work and money if measures did not hit the target audience.
"I have yet to be convinced that the target audience that we are talking about here won't just go out the door and get onto some of the television betting agencies, go to the football, go to the cricket, go to anything," he said.
"There's a proliferation of gambling being marketed out there."