I think the desired outcome is quite necessary but the way of getting there that they propose is inadequate. I tend to think that something in the nature of a fourth company (i.e a third ARes company) in a 30/70 urban battalion (which really makes it more of a 20/80 urban battalion) whose purpose is to stay behind and train and generate another battalion is what's needed.
Indeed, a 20/80 battalion left at home can be turned into the core of a recruited, trained, home-guard or lines of communications brigade using the RegF and ARes personnel that it has.
I'm not that concerned about the higher headquarters folks that the authors want to keep around. It strikes me Canada already has enough GOFOS and staff wienies to generate the leadership of several core and division headquarters. However, a mandatory Supplementary Reserve, with a minimal training and reporting requirement for a short duration (say three years) is desirable. The "fourth" Urban company could be assigned responsibility to administer/train any SR personnel in their geographic AO during peacetime and incorporate them into their mobilization structure.
Equipment. An equipping plan is critical - even if just to requisition pickup trucks from local car dealer lots until new military grade equipment is available. Armouries need much greater washroom facilities so that they can easily be turned into temporary quarters by putting cots on the parade square.
Plan! Plan! Plan! - and exercise it occasionally.
I was quite surprised to hear that the Brits haven't done a div level exercise in years. I do presume they do div-level CAXs frequently. I presume the authors meant no div-level FTXs.