I get why some are jaded by the ever evolving IPA scene. I don't think it can really be called a fad anymore though as it's been around for a long time and shows no sign of stopping IMO. I cant think of any UK commercial brewers who solely produce IPA styles but I can think of many for whom seems to make up the vast majority of the their output. And that just shows you the strength of the market for it. Do I wish there were more high quality commercially produced examples of other styles I love on the market? Sure, but that's the beauty of being a home brewer. I don't buy many IPAs these days and I rarely brew them anymore either. Having learned to brew, I brew the beer styles I want to drink. I've had my fill of IPAs so to speak; but IPA is a big part of what got me onto the craft beer scene in the first place and, to an extent, into home brewing. And the style continues to be a gateway for may 'big beer' drinkers (and non beer drinkers) day - this is a big part of why they are and will continue to be so popular.
One thing I have come to realise recently is that, regardless of your opinion, there is no good that can come from 'hating' on others because of the choices they make. Whether it's big beer, craft beer, hipsters, old school brewers, CAMRA, whatever. Hate gets us nowhere and, amongst other things, only creates detractors out of those who might otherwise become home brewers and advocates of the hobby to further it's growth within the UK.