Replacing our Leos with more heavy MBTs isn‘t really a realistic option considering our perpetually cash-strapped status. MGS brings two advantages:
1. Half as heavy as a Leo, which means cheaper and easier to deploy. I recently read that armour twice as heavy costs four times as much to deploy and maintain, and that the US M1 fleet costs the equivilant of Canada‘s defence budget to maintain.
2. Common chassis with out existing LAV 111 fleet, meaning considerable logistical simplicity and efficiency
Unfortunately, MGS also brings a host of serious engineering problems, protection/survivability problems and mobility problems. My vote would be for the M8 Thunderbolt with RPG protection and band tracks, which is also about half the weight of a Leo.
Essentially the army will no longer be suited to conventional warfighting (unless it‘s prepared to encounter serious problems); Missions like Haiti, Bosnia and Kabul are ideal for our new-look army. To some, then, the transformation makes complete sense. Anyone with warfighting in mind is going to think differently.