I've already pointed out the flaws in that, not least because I'd love to see a bowler try and bowl left handed.
The switch hit has not been made illegal, KP got warned for time wasting because he changed grip/stance before Dilshan entered his delivery stride. It's an existing rule that was around before the switch hit came along with the introduction of T20, there's no issues about how the umpires interpret it, the rules are clear, they just aren't exercised that often because it's quite rare.
Though you seem to be tripping up over yourself with the legal/illegal words in your post.
Yep, the time-wasting rule wasn't connected to Switch Hit alright, but it is a, so to say, workaround, that the bowlers have now found. See a batsman attempt a Switch Hit, stop in the delivery stride. Of course, that can be countered by the batsman waiting till the ball is bowled before attempting it, there by making it more difficult for himself. Makes for interesting cricket.
About the batsman v bowler thing, nothing is impossible frankly - when in the 1987 World Cup final, Mike Gatting was caught off a reverse sweep to Allan Border, it was almost a taboo shot. Today reverse sweep is common and we are discussing Switch Hit. Similarly, five years down the line, you may have bowlers bowling with both hands, who knows.
Interestingly, during the ongoing IPL, Anil Kumble, who is long retired from the game and is currently the bowling mentor for Bangalore, was seen bowling with his left hand in the nets. It wasn't too bad I thought. So with proper practice, not quite impossible.
