Sorry, it's been a while since I've looked at this post. First to address the patent illustrator who has lost his work and obviously upset (Bill)... I'm sorry about what has happened to you (to me as well), but it really isn't the "fault" of patent attorneys as you can read above. Change happens! You either go with the flow, adjust what you do, add to your profession or you'll have to find another job. If you have used on-line travel services such as travelocity because you have greater flexibility and lower costs then you have affected all those that used to be travel agents! What goes around comes around to you as well. Attorneys will always look for a better way or service to provide for their clients and we just happened to be in the middle of one of these major changes.
To address how much does a patent illustrator make? Well, that is very hard to pin down. An illustrator's pay will vary depending upon if they have their own practise, have employees (or outside illustrators under contract or not), how much experience they have or don't have or think that they have...(can demand more or less), what quality they produce, and do they cut their quality in order to stay competitive, or if they are an employee of a firm. I have employees who make as little as $24,000 per year and some that can make over $60,000 (all depending upon how much they produce and their experience of course). If they were on their own they would easily double or triple their income but also would their hours and everything else that would come with owning their own business.
To start now in this field would be very difficult, as all the professionals that have lost half their work are doing what they can to promote their own business (flooding the market with brochures etc.) just to survive. The best thing would be to work for someone already in the field and learn as much as you can from them, and help them to succeed. Over time, they will hopefully help you to take over for them. But finding someone who is looking for employees will be hard. I'm not looking and don't think that we will be hiring anytime soon...
Good luck everyone, remember Patent Draftman never die, they just shade away...