I agree with you on that side of things. It's a sensible policy that has been poorly thought through. If it was me running the business I would have looked at the option of phasing it in.
But I've never run a business before and perhaps there's a good reason for that.
All I know is that if, for example, the club had, say, 10 years ago introduced a concessionary rate for "blokes on comfortable wage but with little or no disposable income for leisure pursuits" then I would have bought a season ticket in the knowledge that I was only doing Si because I was being offered a discount. I would always gave in the back of my mind that the concessions policy could change at any time and that if my concession was withdrawn I wouldn't see it as something being "taken away" rather i would see it as my price being normalise and be thankful that I've had 10 years of discount.
Just a different perspective on life I guess. More pragmatic perhaps.