That is all possible but comparing this to MMA now?
How much time away from trying to play hockey better does he dedicate to fighting? MMA players focus only on fighting, not on skating, shooting, IQ, etc...
Seems to be a lot of, "in the very best case scenario, IF he does X, Y, Z then he will be good" type of suggestions.
Also, you need to like to fight and be willing to fight.
"It isn't the size of the dog in the fight but the amount of fight in the dog" is a true statement. Did Boucher ever dream to be a tough guy who fights? If not, he probably focuses on trying to score more and be a better hockey player overall for quite a while before throwing in the towel to be a fighter.
I brought it up in the context that fighting is a skill that can be taught and developed. Hockey fighting is challenging in its own way but it is far less complex than boxing and mma and far easier to get competent at.
A hockey fight typically last 30 seconds to 1 minute at most, so there is no need to be concerned about pacing oneself and conserving energy. It is solely inside fighting, inside the pocket so there are no real concerns with learning footwork. There is barely a need to use feints or to bait an opponent to set up a counterattack as the fight is too short. Most fighters simply throw haymakers and leave themselves wide open defensively so there is very little concern with trying to create openings.
A fighter with basic boxing fundamentals is well equipped to win most fights. They need to be able to bob and weave, be able to cover their head and body, be able to throw a jab, cross, left hook, right hook, left shovel hook, right shovel hook, left upper cut, right uppercut and an overhand, they need to know how to assess their range and their opponents range, how to generate power in their punches while keeping a themselves on balance and maybe a bit of understanding of how to parry punches.
Sure it can take a while to really master the fundamentals, but most hockey fighters don't need to master the fundamentals, they just need to become moderately competent at it.
I think it would benefit any physical prospect to have some basic boxing training so they are comfortable with the possibility of fighting. If they are powerful and athletic then the boxing fundamentals could give them the foundation to become a pretty good fighter and at the very least it will help make sure that they are unlikely to get serious hurt from a fight.
With Boucher, I don't think it is a guarantee or anything but I do believe that if he does decide to develop his fighting skill through the proper methods then I won't be surprised if he is mauling people in his prime.