When will being a Support Secondary stop meaning a Support Primary?

So, I'm not one to complain about support as a role. I'm good at it, and fine with playing it. BUT I want to be able to practice / learn my primary role more than support, even if it means waiting longer to get a queue. Plus it's frustrating never getting Marksman unless I queue with my secondary on jungle / mid / etc, and even then it's not guaranteed. :/ I get that we should have checks and balances to be able to play other spots than just one, but having to play a secondary role over and over when I'm wanting to improve on my primary kinda stings.