As it was noted, I tried to do a paper on the consensus of what economists think of what's needed to impact the growth rate, and you won't find an awful lot of economists supporting the cut of the GST. It's extraordinarily effective in reducing the tax burden on people. It gets money into their pockets, but it doesn't give the incentives to increase savings or investments, and therefore it doesn't have an impact on growth. So clearly, almost any economist will give an answer of no. They'd rather work on the tax rate on income and capital rather than on consumption.
On November 23rd, 2006. See this statement in context.