After having been forced into union representation for almost 20 years in another job , I am not a union fan...but I've tried to not let that cloud my judgement too much as a part of this conversation. (That was as a govco employee - not an arborist...but job title wouldn't have mattered because everyone from the guy flipping the "stop/slow" sign on the road crew to prison guards to professional engineers and foresters all had the same contract.)
Back on the topic at hand... after the quoted reply, I think I am starting to get where you are coming from: If we are going to be regulated, we need to be trained. Is that a fair summary of a starting place?
Then, I think, the next step you are seeing is that the model that you seem to think best fits this is a journeyman program as offered by skilled trade unions?
I can see that.
I happen to disagree that unions offer the best model for training...I know plenty of highly knowledgeable and skilled arborists who did not come through any formal training program.
I'd also argue that knowledge is at least as important as skills to our profession (and that, for the most part this is a "profession" more than a "trade". Think doctor vs. welder...both are great careers, both essential to the advancement of the economy, but they are quite different in both requirements and how you get "there").
Additionally, this is an extremely variable industry, so beyond some basics, it would be hard to have a successful journeyman's program. For example, I think none of the following individual skills are necessary to be a great arborist...you need something, but not all;
*Tree climber
*Crane operator (whether assisting a climber or running a grapple crane - both very different)
*Aerial lift operator
*Spray technician
*Diagnostics
*Tree planter
*Fertlization
*etc....