Instead, I fear there could be a long learning process, just as when inflation trended down over recent decades. Moreover, a higher inflation target might also mean that inflation would be higher than can be ignored, and businesses and households may take inflation more into account when writing contracts and making investments, increasing the odds that otherwise transitory inflation would become more persistent.
For both these reasons, raising the longer-term objective for inflation could make expectations more sensitive to recent realized inflation, to central bank actions, and to other economic conditions. That greater sensitivity would reduce the ability of central banks to buffer the economy from bad shocks.