They are definitely looking in to the possibility of flexibility in choosing champions, but I think there are a few important flaws in allowing that option that work together to make it not a good idea right now.
The first flaw, is that if you can select champion in lobby, then there is nothing forcing you to actually go the role you said you would or in fact follow whatever meta the captain set up.
There are a couple possible solutions to this, but each has flaws:
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you could set it up so people choose champions, then after champions are locked, the captain has a new chance to kick and the players have a new chance to leave. the flaw here would be that you add A LOT of time and backlog to the queue process. Each time you have to wait a time period for players to select and lock in champs. then if someone isn't happy and a player is kicked or dropped, you have too start all over and wait the full length for champion section again. Rinse and repeat as many times as it takes for people to be happy and that could get pretty long.
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the second solution would be to set up some system similar to the current system (where you choose a champion in advance) but with some flexibility or option to switch champion at the team and/or captain's approval once in lobby. This way you can't change to something crazy without others approval. They actually tried variants of this idea when developing TB. You can find posts where they discuss this, but it turns out this had the negative side effect of reducing champion diversity and discouraging un-orthodox picks. If you let others approve changes, then they can also pressure or bully (i.e. threaten to kick) a player if they don't switch away from a champion others don't like in the lobby. You can read more about this in one of Lyte's posts here.
I'm actually very interested in having some sort of champion flexibility in TB as well, but I don't think just open champion selction is the answer. Please stop by a thread of mine discussing this and see what I have to say and share your thoughts if you're intersted: link here.