I don't agree. Defensemen will still try this play because it's not a guarantee that there will be a penalty called and if they do get the puck first there won't be a penalty shot - that's part of the rule. I agree that poke-checks like this are exciting, but so are breakaway goals.
I concur with Triumph. This is a high risk play that in the past where the punishment has not been enough to deter it. Now if you're a defensemen, you have to be SURE you will get the puck and only the puck if you're going to make a desperation dive. IMO the rules should reward skill over luck.
Also players will tend to try to physically punish the opposing player as much as possible, so even if you got the puck in the past, why not follow through and trip the man if you're not going to get a penalty for it?