If you can't use it, you carry it forward and hope you can use it in future. Note that the value of the loss does not increase with inflation, so it declines in relative value to you, too, as the years go by.
When it makes sense for you in future to have a non-registered portfolio (or secondary real estate investment), then you would select something that would generate capital gains preferentially to interest or maybe even dividend income, all else being equal*. (*Which it rarely is).
Basically, just buy what you would anyway, but if you are adjusting your decisions for taxes, know that you can have the first $32k in gains tax free, (like investing in a TFSA).