You may want to use it, even if you don't have much taxable income:
https://www.financialwisdomforum.org/forum/viewtopic.php?p=669597
It can be a useful tool even for a low-income spouse. It is important to think about your own future tax situation, though.
Thanks for the link. Good response about the time value of money on the tax rebate being deferred being negligible because the owner is already in low income tax bracket and just wants to shelter earnings.
A couple of benefits of having substantial RRSP room -
1. to absorb windfalls.
2. when you die, your RRSP rolls over to a spouse and if no spouse, becomes immediately taxable in the year of your death, as though it is income, at full tax rate. Which will be pretty high if you had it maxed out. If you die before you expect, you could still have a huge RRSP with a major tax penalty on it. You won't care (you are dead), but your kids might.
In contrast, you can set up and use an RESP for 35 years this way, like a TFSA, but only up to $50k of contributions. You can set this up on anyone, including yourself. $$'s of profit used on education are tax free. Withdrawal of original capital is tax free, So if you plan on any type of school in future this could work. (Commercial driving school, bartender school, study a language in a foreign school, etc).
Also see spousal RRSPs for more ideas. Here it is just a plain old shift of taxes from high to low over 3+ years, if your spouse is low income, but that beats waiting for retirement to do it.
