IMHO, if people need an air to air frequency for formation flying etc, then they ain't doing it properly! Those who NEED an Air/Air frequency normally get one! Those who just want to compare notes really dont need one..
Having just been across Europe in loose formation with another aircraft, I think your humble opinion is rather trite and way off the mark. e.g. "Don't like the look of that weather ahead, I am turning left onto XXX degrees, heading for YYY airfield." If you can't talk air to air, how precisely do you communicate that information?!
In the REAL world, talking air to air with another aircraft can / could be extremely useful and contribute to flight safety. The argument that it shouldn't be allowed because it would degenerate into crap is ridiculous. It's like saying you shouldn't fly with retractable gear because sometimes people forget to put it down. The key is education. Right now, people talking air to air do blather on about a load of crap because it's completely unregulated and a free for all. If air to air frequencies existed and there was pilot education about them and the importance of keeping transmissions brief and to the point, we might see less rubbish out there. Drive it underground and of course it's anarchy.
This is happening all the time, every day and it's time the authorities woke up and saw sense.