I think too much stability is self defeating. It creates fragility like a monocultured ecosystem. Self correction mechanisms are important, even if they're painful. Bad governments and bad enterprises need to be wiped out now and again by war and recession, as a last resort when other forms of reform fail.
Britain never seems stable at first glance. Read a newspaper from 5, 50, 150 or 250 years ago and they'll all be lamenting economic uncertainty, geopolitical dilemmas and social injustice. Yet in that time no revolutions have killed more than 1% of the population, long term economic growth has averaged couple percentage points annually and nobody has successfully invaded the Islands.