I agree with PPCLI Guy that the idea of the Pioneers as indiv skill sets amongst the Rifle coys is probably about as good as we are going to get at the moment. (And, worth noting, came about under a CLS who was NOT an Infmn...but PPCLI Guy has a better sight picture on that one, no doubt.). Let's take this gift, smile, and keep on scheming, instead of pouting and asking for the moon.
That said, I agree 100% with Dangerboy about what happens to special skillsets in a rifle company: they tend to rot if hte OC and CSM don't work hard to keep them sharp. And even then, with the best OC and CSM in the world, there are so many corrosive forces out there that make it difficult if not impossible. At least, it was when I was on Regtl duty. That was a while ago, but my guess is that things aren't really too much different. It probably takes all the horsepower available just to man the LAVs and keep up those crew skills, along with a basic level of Inf skills. (Anybody more current can jack me up here...)
Cheers