When you staff Rescues and Ladders with two, it can free up a lot of funds for capital projects like mobile Driver Training vehicles and fancy Command units.
The Driver Training system has the virtue of being unique and innovative, I’ve never seen or heard of something like that anywhere.
The Command is another thing all together, since each DC is a miniature Command vehicle, the larger Command vehicle seems redundant. I can see these rigs being useful at large events so the brass has a warm dry spot sit and command from.
I’m sure CFD doesn’t regret these purchases, but I doubt the mobile Drivers Trainer will be replaced when the current rig is put out to pasture.
I would think that the Mobile Training truck is a bit regrettable, as it doesn't serve the purpose it needs too. Much of the money was spent on the in-truck simulations, which didn't serve their purpose. It wasn't realistic enough, it made some firefighters motion sick, and the graphics became quickly outdated. (As a person who's had the chance to try both, GTA 5 is much more realistic, just to give some perspective)
It's only practical use is actually driving the truck itself. But one has to wonder if a spare truck would achieve the exact same results. (Plus, the MT doesn't have water, which is the most valuable and teachable difference in driving fire trucks.
As for the Mobile Command, it absolutely serves a purpose, it is a required part of the CFD. Even though it's only run a handful of calls (I can think of 2) it is a big part of CFD ops. DC vans are great for operations where you need two or three people from one agency in command. Luckily, Calgary hasn't had any major events lately (knock on wood) so there hasn't been a need for such a unit.
The ability to run an independent dispatching and radio station, along with having a computer room to facilitate other agencies (Atco, Enmax, CalSAR, AHS, CEMA, CanTF2 etc) it makes sense to have a unit that can house delegates from those agencies under one roof. There are also some other perks of having that truck, but for the sake of this being a publicly accessible forum, I'll exclude for now.
I get there's a high interest in purchasing units that will consistently be required upon, but the fact of firefighting is to be ready with equipment for anything the city might throw at you. So in this case, having a truck like the MCU is an asset, not a cutback.