The biggest problem in overcoming this is that photography is many peoples' hobby as well as being some peoples' livelihood...
I also know few people who would call plumbing a hobby...
Because of that there are many more amatuers - sorry: armatures - in the photographic world whose skills, real or imagined, allow them to participate in the same arena as professionals.
I cycle for laughs, and own bikes that cost more than some of the cars I own, but that doesn't mean I could start Stage 12 of the TDF on equal terms with Armstrong et al...
Good post, but I think your last point fails in the analogy.
You may be able to purchase the very same cycle equipment as Armstrong - but you are actually unable to compete at that TDF level because you are not at the same level in ability as Armstrong. There is a huge gap in ability.
With photography; yes, I can go out and buy a D3s or whatever it is, and have the same lenses as a pro would use for a given job etc... and again yes, I won't be at the same level as a pro - but the difference in the levels is what is key here. Not many people are close in ability to being a pro cyclist, but many more people are close in ability to being a pro tog - they may not get there, but the gap is significantly smaller.
Let's face it, re photography - the gap is continuing to close, and closing fast. Amateurs are simply catching up to pro's and the pro's don't like it.
When the market sees that Uncle Tom Cobbley and all can get a decent enough image with what they see as an off-the-shelf camera, they are not going to be so willing to part with any serious money to have a pro come and do a job for them when they can get someone who is willing to do the same job with - for them - similar results - for (often) significantly less money.
Market demand forces at work here.
Also; advances in sensor/camera technology and the relative lowering in price for these advances has put cameras that pro's use within reach of many more people.
Pro togs need to stop worrying about Uncle Tom Cobbley, and concentrate on justifying why people should pay whatever it is that they charge for their services. Just differentiate yourselves, identify your USP.
Successful pro togs do that.
to the amateurs reading this: if it could be putting bread on someone's table, please just...think, and don't do it

second shoot, or take candids, whatever, but please don't steal someone's work because it's your hobby.
Dave - sorry, this is total and utter twaddle, and I am certainly not, as you put it, "stealing someones work" either. Is this work 'theirs' to own, and thus I steal it. No, of course not. If you had the booking, and I undercut you - that's a little closer, but still not stealing - it's business!
So what am I to do when I (as an amateur) get asked to do a family portrait session. Let's seee... should I say "Sorry, I can't, I need you to call a pro because by my doing it I am being cruel to a pro tog who hasn't been asked to do this job, nor have they found this specific piece of business"
Naaah... I'll take their money and do a good job for them, thanks.
Get out there and find the work, just like I - an amateur - do.