Retail space for creative use is likely to increase so there will be more 'supply' Demand.....A fad Jeremy, really? Festivals, outdoor events, streetmarkets have grown massively big 'customers'People are used to it, people have less time to fit multiple activities in, trends spraed downwards, there's been 'pop up' food of sorts for years when demand demanded it - outdoor sports, late night kebab vans/chip vans/, roadsie trailers...even Mr Whippy is a version in away :) ; but the food and variety available has expanded to match change in tastes. The ultra trendyness may go but a fad? You're joking, it's here to stay.