Andy, you have to move with the times when places evolve. Relatively speaking it's only a tiny part of the island where things have changed this year. Other parts of the island have gone through similar highs and lows before and will again. But if demand is down this year in San Antoni then it's just one of those things.
The West End is such a small part of what a really beautiful island has to offer. If what you love is limited to San An and the people there I honestly think this is more a reflection of not having got out to appreciate the rest of the island more, especially the North etc. But it's understandable in a way if you've worked there and stuck to a relatively small 'stomping ground', the seeming demise of that takes on a proportionately greater significance and more so if you depend on it for a living.
Get home and then have a look back objectively... and if you can take some time out next week to see the rest of Ibiza whilst it's there on a plate. And I don't mean Playa d'en Tosser - there's the whole East coast up to Es Canar, Salinas etc. Your attitude about going back may change after you look at these places objectively, and also look beyond the bars and clubs. It's one of the most beautiful and rewarding places to be that I've been, but very few people can expect Ibiza to provide a steady living over a Season and cover their costs. You can, however, still appreciate the positives of the island - and accept that the price of being there is often instability and work can be unstable unless you're a top-name DJ etc. so you need to be prepared to heavily subsidise your time there (as so many wind up doing) when work isn't about.
Having a steady income blowing up in your face and watching a venue which had likely 'come of age' close after so much effort is as much of a headf*ck anywhere as in San Antoni. But it happens all over all the time for different reasons. I can fully appreciate this is all likely to come with a lot of mental and financial issues to grapple with right now. But in reality August will most likely be busy enough (as always) and so I think objectively you just went over a month too soon, the bars misjudged the market and you had some very bad luck with the venue involved not having the pockets to ride a lull. Being self-supporting in Ibiza is hard for anyone and even people like the Sankeys guys have nearly bankrupted themselves trying to get something enduring off the ground there whilst their club was empty at the beginning. With a few notable exceptions, bars and clubs just aren't a steady or secure line of business to depend on.
Places are reinvented, faces change and it all goes on regardless. Things turning sour does make the scales drop from your eyes - but that's a good thing in a way as it helps you separate the dream from the reality. If you can't live with the reality alongside the dream then it's definitely time to move on. But don't blame the island - nothing's really changed there. It's the visitors to it and what they want (or don't as the case may be) responsible for what you're going through

.