Jonathan, yes - in principle no argument, we're saying the same thing in different "tonality" - but the simple fact of life is and always will be that 95% of the world (at least 95%) will not have "colour-managed displays, and they wouldn't even have a clue what the concept means to start with. I won't get into what they deserve, because that's unecessarily judgmental, but let us simply recognize the problem is there, it's real, and the OP is looking for a quick-fix curative. We're agreed there is none - for now.
But thinking forward, wouldn't it be nice if there were some univeral standard, like an ISO spec, to which all displays manufactured anywhere in the world would conform right out of the box (i.e. they comne shipped already claibrated and profiled), with instructions to viewers to leave the display buttons untouched unless they have special reasons for tweaking them. Yes, it would add a few bucks to the cost of each display, but it would go a long-way to standardize viewing conditions for web images and make the outcomes for image posters more predictable. Drift of LCD displays is low, so this kind of solution would be durable enough for a reasonable period of time.