I think and know there will always be a need for climbers, that was not what this thread was started out as. You need to evaluate the kind of work you will be doing and get the best equiptment you can afford. Where I live and work we don't have 150' tree's, small, back yards, fenced in yards, at least very few you can't get into. I do alot of city work overhangs, side trimming. My bucket's boom goe's 135 degree's overcenter and mounted at the rear of the truck. On city work the truck is way faster than a climber, set in the middle of the road trim both sides ground man piles brush, Then move the bucket forward, ( I stay in bucket ground man moves truck forward) and so on all day long. Then we come along and pick up the brush with a Prentice grapple truck. I do very little chipping locally no cost to get rid of the brush. Only chip when a long way from home. Sorry so long my point is get the stuff you need for your area check out your competators and see how they do things good luck.
Dave