This suggestion regularly comes up, including from Rowan Williams, whom I usually have great respect for, but I think it's a bad idea. Conservative Christians will be in uproar if it's ever introduced, and will insist on celebrating it as a moveable feast, as now, so it'll just cause confusion. Anyway, unlike Christmas, Pasch (Easter, if you insist) has to be on a Sunday, so it couldn't be completely fixed.