What are you talking about? With segwit we get 2-4 mb 
if I'm not wrong.
if I'm not wrong.4mb? no way, at best it's 2MB, actually a bit less, but miners do not agree in the activation, it will never happen
It probably will happen, as Segwit probably will activate. Yes, blocksize increases do carry risks, so doing the fork the right way is very important. Not everyone agrees on how the fork should be done, lol