RE: IMPACT PLAYER RULE IN IPL GOOD OR BAD?

It only undermines the role of the all-rounder if you assume that you can win games with just 5 bowlers. Most of the best T20 teams have at least a 6th bowling option and some have more than that. However, teams aren't picking 6 bowlers who can't bat and then subbing one of them out for a batsman because that would still leave them with a very long tail. Therefore, all-rounders are still important and if you don't believe me, just look at the IPL auction and which players are going for the biggest money - Stokes, Curran, Green, etc.

In my opinion, it might be a good thing because it gives an advantage to the side bowling second to assess the conditions and bring in a bowler to suit those conditions. Too often, T20 games are won on the toss of the coin by the side that chases. We'll have to wait and get a bit more data to see if my theory is correct!