This idea is still fundamentally flawed. Like someone mentioned before, champions who need to flash out of a bad spot would become targets, and wouldn't get picked any more, making probably even more champions less viable than some people already see a good number of them.
Your answer of playing smarter just won't cut it when you have some champions that require you to be stationary a lot, or are excessively slow out the gate. Champions like Miss Fortune's who's ultimate ends if you try and move, or corki, who is possibly slower than even Alistar, and is fairly stationary when using his Q and R. Yeah he can peel away with his W, but fact is, he's still RIDICULOUSLY slow, and with so many champs that have speed boosts, like Yi, Warwick, Skarner, Volibear, or dashes like Lucian, Ahri, Diana, you get the idea, he'd be easy prey. His ability to peel and flash at present are one of the reasons he survives so well, and Miss Fortune can close a gap to do serious damage to a team with her ult, or peel back so she can use it safely, without having to worry about breaking it early.