Its related, going paperless and cashless are related. Cashless will effect you because it means bank records for sessions unless you can come up with some business name that passes.
Ok, we are talking CP. Carney is pushing an austerity package, this cut will be part of a series of cuts just as we are edging towards recession. That will make it worse and the usual way to get out of recession is by government stimulus. Likely we can pull back some delivery of the post though we'll still make some businesses either shut down or raise costs as they have to move to american or international deliveries. It means Canadian businesses won't be able to compete with Amazon, who can deliver faster and cheaper already. That will lead to more business closures.
That cash could easily be found by cutting oil$gas subsidies, there is $28 billion a year there. Or by raising taxes closer to the historic norms on the 1%.
Sure, we could close and rearrange postal offices and make it so there is only one close to you. That could save some cash.