The cost of fuel, or rising costs in general, won't directly affect our caravanning but they will affect the legacy our son gets eventually - and we're continuing to support him and has family based on present needs, not future ones.I think most people would have some financial threshold for the cost of fuel that will make them think twice about some caravanning trips, It's a question of what each person's threshold is and what affects it. It may not be a stationary value, and it will almost certainly be affected by other events, such as loosing or changing an income stream, Other rising costs which reduce the available funds for caravanning, and that of course could include rising site fees. Unforeseen extra expenses such as find care for a loved one etc.
The one change we've made is to drive more slowly which saved about 10% of fuel costs.