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I haven't been to Cali but you will be right. Salsa Calena as a swing based dance is very different from other salsa styles. Therefore, Calenos maybe less interested in international dancers and, on other hand, professional dancers like Juan Camilo Diago move to other places to get further inspiration. A former teacher of mine, working for Conjunto Nacional and Rumba All-Stars went to Cali recently not only for shows but also to give classes. I have been dancing in Barranquilla for example and the dance schools there focus on enabling locals to dance at parties.The above may be true re. Mexico and Lima, but you're way off re. Cali:
the Cali venues/events that play just salsa or salsa mixed with timba are full of untrained dancers.
yes the city has numerous dance academies that teach salsa, but 'normal people' i.e. those who've never had dance classes are well aware of them, partly because they are very common, and also because their focus is preparing for competitions which are watched by many non-dancers (live or on TV).
99.9% of those dance academies teach the local style, so salsa stars from Europe are of no relevance to them and do not get booked to do workshops.