John. your point is valid, and in a modern society, travel and holidays should be available for everyone with different budgets. therefore the key is to put quotas on the amounts of planes, cruise ships, super yachts, etc . these quotas could be negotiated annually allowing also for adjustment upwards or down wards with government and those companies effected. This would put the brakes on the relentless profit only driven companies like the airlines, cruise ship companies and make them rethink their product, to not more and more but to better service higher quality experience etc as marketing tools to a destination that remains desirable for decades to come, and to abandon the short term dumping of maximum capacity tourism for quick profits. The global fishing industry already works like this as otherwise there would be hardly any fish left in the oceans.
I hope the Emergency services will be on standby when all of the cases of people passing out due to heatstroke start coming through.