When vanilla dropped I found it absolutely hilarious that you could cancel DPs. A cornerstone of SF to me is that when you commit to a DP, you damn well better be sure its going to connect, so the ability to cancel out of it struck me as very un-street fighter. Another cornerstone is the delicious punish you are free to apply when your opponent screws up a DP, flashkick, etc.
This whole FADC cancel business on block struck me as outright cheesy and I'm OK with it now being -5. This coming from somebody who uses characters with mashercuts too. When Capcom was fielding for Ultra suggestions I pitched in that FADC DPs should be -3. When they announced -5 I was really surprised. It'll be interesting to see how people adapt to this change and it's interesting to think that it has quickly become a staple mechanic in many ways.
I'm a bit of a meter horder so I can apply it elsewhere, but I must admit when I catch myself cancelling a DP lately I make a mental note to cut that shit out as in Ultra its going to cost me. Hell, last night when Capcom had that showcase with Daigo, Bonchan, Tokido, et al we got to see it in action and it was really interesting. Bonchan (sorry Heavy, Solar) charged in on Daigo's Ryu with some up close pressure and then smashes a kara uppercut out at the end. He cancelled and Daigo responded with c.lp x3 > fs.lp > c.hk. Delicious.
On the other side of the spectrum, you had dudes asking that FADC should only use one bar of meter. Now that's funny. Christ, imagine it. I'd love to see Carnage's XBL inbox if that happened.
I have no doubt people will adapt. The biggest roadblock I think will be muscle memory for many. Shit, I remember when AE dropped and I instinctively tried to coward-copter out of a corner and got my first demo of that goofy ass version. I ate a bunch of damage and quickly learned my lesson. I expect a similar scenario will apply to the DP cancel change.
Or not. I'm pretty retarded.