I think that the 9mm compact has a long road ahead of it. I've had the pleasure of shooting a CZ 75 RAMI, a Glock 19, and a Bersa compact 9mm, and they were all great guns. I think that if any 9mm pistol is doomed, it's the subcompact. I've tried both Ruger's and Kahr's offerings, and I just don't care for them. They kick like mules, their accuracy is lacking, they're tempermental, and neither of them is truly capable of being carried in a pocket. They carry great in an IWB holster, but so do the afore mentioned 9x19 compacts if you get a decent IWB rig. I had the LC9, and I wound up giving it to my son cuz he liked it... well, he liked it then. He now keeps it for a spare, and has gone to carrying the Glock 19. I suspect that quite a few other people have also grown disenchanted with the subcompact 9x19.
The 9mm subcompact doesn't really offer anything that a good snubby, Walther PPK, Glock 42, or Bersa Thunder doesn't already offer. The three .380ACP pistols I just mentioned may be chambered for a slightly less potent round, but they're uber controllable. Just about any shooter who bothers to put in the range time like he/she should will be able to cut the center out of the center out of any target with any of them at 5 - 7 yards, and be able to it really fast- and I think that two or three 9x17 rounds delivered fast and accurately to center mass is gonna get the job done. A snubby in .38spcl will group quite nicely at that range as well, assuming the shooter bothers to go to the range once a month - and snubby's have been getting the job done for about a century now, and are even more potent with good self defense ammo like the FBI load or the NYPD Load. Thus, I'm not convinced that most of the 9x19 subcompacts will still be around in 10 years. I think that most people are gonna come to the conclusion that they were mostly an answer looking for a problem.
If I want really tiny and discrete, then I'll just slip a couple of NAA .22wmr minis down my pockets. A .22wmr round, especially the newer .22wmr self-defense rounds like the Hornady Critical Defense, at room distance is a nasty little beasty - and room distance is all I really concern myself with.