will not be an improvement at all I'm afraid.
I don't wanna chose my role before the champ select.
I usually decide after I see at least bans or even some enemy picks and my own team picks/calls.
It also depends a lot on where I'm in the pickorder. Am I firstpick? I wanna firstpick jungle.
Am I lastpick? I want mid or top to counterpick.
The new system might solve some problems (like 3 main junglers in one team which I recently got several times :-),
but many new problems will emerge instead, especially for players who are not the "mid or feed" type.
For example I main jungle and top but when I see enemy picking Zed,
I wanna ask my team to go mid against Zed because I'm good vs him.
Or I chose jungle in the new system and then they ban my 3 main junglers
so suddenly I would rather go top or support.
Or I chose top but then I will be firstpick and I will not want to blind pick top champ.
You see? there are just so many possibilities in the current system; picking role in advance would totally ruin it.
The current draft pick is just ok and works well enough if you are not a troll yourself.
And maybe once in 10 or 20 games the champselect goes totally wrong just dodge it. Not the end of the world.