Go ahead and try it. You'll be the first to pay the baggage charge for a carryon! And your fellow passengers will certainly appreciate your thoughtfulness and courtesy.
You think the airlines are doing this stuff because they WANT to? Has the effect of the cost of jet fuel on airline operations not yet penetrated your consciousness? This isn't chutzpah, it's survival.
If they didn't start charging more, they'd really be cutting back on flights. Like to zero.