Thank you very much for the question. I hope I got exactly what you were saying.
I was very much opposed to increasing the limit on TFSAs from $5,500 to $10,000, largely on the basis that it would benefit mainly people in the very high income groups. When we're facing a situation where inequality in income and wealth is growing very rapidly, to me that doesn't seem to be a very good use of tax dollars.
Moreover, as an economist, I think that TFSAs are not the only assets you can buy with returns that are exempt. I come back to the case of housing. To an economist, investing in housing is more or less the same as investing in a TFSA, and there's no restriction on investing in housing.
There's ample opportunity for people to invest in assets the returns from which are not taxed, so it didn't seem to me to be the purpose.