A cure for the "support issue" with new que times

I usually don't post my opinion on how to fix something because I always just think riot probably has people smarter than myself working on it. But this time I felt like I had a decent idea so I'll give my two cents. These new q times have been rough. And we all know that it's mostly because no one wants to support. So how do we fix it without screwing up the system or reverting back to the previous system? Here's how I would do it:

1)Have an invisible third role for everyone that is marked "fill". Therefore the next match would take the first person in q that has fill. HOWEVER...

2)have diminishing returns on the person who just had to "fill." So basically let's say your primary is mid and your secondary is top(and obviously your invisible third role is fill). But next game you were in the top of the q and had to fill for the team and now your supporting. For the next three games, your invisible fill spot is gone. Therefore you are guaranteed your primary and secondary role for the next three games. Then, after the third game ends and you hop back in q, the system reads you just played 3, and your fill position is back up. Now, you might not get support the next few games because it depends on who has the fill spot up or not. But, with this system, just like the old system, everyone takes turns doing support, or "filling" of any sort.