In my view, the pace of further disinflation in accession countries should be determined in line with the overall economic situation, in particular with the need of countries to increase real convergence. The Maastricht inflation criterion should not be seen as an immediate requirement for the EU-entry, but rather as an objective of central banks during the period of ERM II participation.
But to stick to it and it's definition as formulated in the Maastricht Treaty is a MUST. The Eurosystem’s policy position that nominal and real convergence should be pursued in parallel and that accession countries should strive to achieve price stability in the medium term is very sensible.