Interesting OP and certainly worthy of discussion. Like any trade it depends on what we would get, and where it would leave the club.
If Hamish continues to be average for the rest of the year then this option is worthy of exploration at least. Goldy is a much better tap ruckman and seems to be as fit as H. Add to that his skills are quite strong and he could potentially take over the number 1 ruck position pretty soon.
Monsters' ruck work is shizen, really, really bad, but his real value has been his ability around the ground. He has very good skills and decent mobility for a guy his size and is a great set shot for goal. Problem with this though is that he doesn't really have much of an engine and seems to be struggling to exert any influence on games now that most teams employ tight zonal defensive structures as he cannot get loose in open space to be a link man. I like Hamish, but he really needs to step up and become an A grader. He needs to work hard on his tap work and stop hitting it just anywhere and try to become more influential around the ground. If the club did decide to look into a trade the Hawks would be keen as mustard I reckon but a deal should only be done if it is too good to refuse. Their first rounder at least plus a player. No arguments, they still feel they are a few pieces away from another flag and if they want a good ruckman they need to pay. Gold Coast would take him for sure but that would mean we would have to rely on the AFL's unfathomable logic to determine what we would get.
Another issue with a possible trade is that most teams feel that two rucks is the way to go, with the exception of Freo. If we were to trade H out, we would need to either move Hale or Petrie back into the ruck or promote Majak to the senior list and play him most games. I'm not sold on Hale as a ruck and would hate to waste Drew there as no real forward options are yet to present themselves as legitimate options. Majak has done little to suggest that he will be AFL ready next year, other than jump over his opponents in the ruck, take a hanger and drill one from 50 on the run, in both the right goals and the wrong goals.