I wont be using segwit addresses if they are coming out. there's a possibility miners could at some future point decide not to validate their signatures.
there is a possibility, but it will not happen, it's like saying that it is possible that miners will stop accepting transactions and destroy bitcoin, of course it is possible but won't happen. Just think about it, if they actually decide to not validate the signatures they would kinda destroy the bitcoin because if segwit gets activated literally 90% of the users will be using it in order to send over the money.