Although the law (Canadian as well as Islamic) does not say that making of the will is a must, but by looking at the consequences of not having a will, it is necessary – both from legal aspect as well from the shari’ah aspect.
Firstly, if a person dies without a will, the government appoints an executor who will divide the estate among the heirs as he/she seems fit. The pay of the executor for this job will come out of your estate, and the government system takes it time in getting jobs done!