On the other hand, if you don't care about backward compatibility, I guess completely eliminating constructor syntax in favor of C++11 uniform initialization syntax is a good solution as any. (But maybe curly brace haters won't like that solution.)
For instance, type-inference is completely borked:
auto foo{tmp};
std::initializer_list<decltype(tmp)>
std::vector<int>{ 3, 4 } // => [3, 4]
std::vector<int>( 3, 4 ) // => [4, 4, 4, 4]
The vector case is unfortunate, but I'd personally argue the defect is in the vector class. There's no significant performance advantage, that I can see, to the (n, T) construction over a default construction followed by v.resize(n, T).
[0] http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n392...