That's a valid point, and something for me to ponder.
I'm not sure the mass amounts of people required for a land war are a valuable use of our limited resources, being a small country with big material output potential.
I have and continue to believe that the best use of Canada's rather limited ability in an upcoming conflict would be as one of the factories and delivery services for the materials of war for our allies.
I'm all for Canada leveraging it's resources and (hopefully soon to be restored) industrial might to support our Allies but sometimes it might also require Canadian forces participating in the fight...be that from the land, the sea or the air (or all of the above). Just like anything in life there needs to be a balance. If you focus so much on one (or just a few) aspects of your defence then enemies will pick those areas that you've ignored to target you in your weakest domains.
And sometimes we overplay our "limited" resources. We're a G7 country with 40,000,000 people. The same size as the United Kingdom in 1939 who had a 1,000,000 man Army at the outbreak of the war as well as a 1,400 ship Royal Navy and an RAF of 2,000 aircraft. Now I'm certainly suggesting that Canada needs a military any where near that size but a CAF of at least our current authorized strength and a significantly beefed up Reserves shouldn't be a serious burden to the nation.
Why does Canada need take and hold enemy territory ?
Who says it has to be "enemy" territory? How about holding Allied territory against enemy aggression? In defence of our ideals, or suppliers of our critical resources, or securing key trade routes/choke points, or defending Canadian nationals, etc.? Any yes, maybe if a foreign nation is threatening our national interests then maybe we will have to fight on their territory in order to eliminate the threat.
Canada needs an Army, but I think it should be a territorial Army focused on continental AD and national defence.
That is certainly one very important role we need our Army to fulfill. But Canada is not alone in the World and like it or not we are dependent on interactions with other nations for many things including trade, technology and resources. If we try to just sit back in our own little bubble then we won't have the capability to protect our interests when the things we depend upon outside our bubble are threatened.
Do you believe we have the ability to project power now ?
Our ability to
independently project power right now is seriously limited. Hopefully that is slowly changing with incoming capabilities like the River-Class, submarines and JSS for the Navy, new fighters, P-8's, MRTT's, MQ-9B's and AEW aircraft for the RCAF. That's also why we have a network of similarly minded Allies that we can work together with to project power like we did in Afghanistan and are now in Latvia.