Well, I kind of understand the sentimental part of antillian's worries..
Firstly, let me say that I play on a casual basis and want to have a good time as Mnb says.
My problem was last year with the KID, which this year I have decided to abandon for the Dutch Leningrad (some of you guys have given me advice on that issue in the past).
I loved the KID and the positions arising suited my style a lot, on the other hand, after a point I started losing with it (in many main variations, plus some anti-KIDs; and rather easily), plus I had no antidote for the exchange variation. Of course I could solve these problems by learning more theory (and this is one option for you if you insist with the Pirc). The other solution is to use the same time to read another opening (which though it worried me, I finally did).
The results were the following:
- I have read the material rather quickly and enjoyed it a lot.
- I have now some practical experience with the new opening (at least when playing OTB I feel as confident as when I was playing the KID).
- Sometimes, I may get OTB an improved version of the KID (this is a bonus).
- The Dutch Leningrad borrows some ideas from the KID and I particularly aim for those set-ups first. In this way the transition is easier and I still gather some KID-like experience if I decide to use it again in the future.
- Most of all I loved what I feared the most: the "pure" Leningrad systems!
So, my idea for you is why don't you reconsider the Dragon? One substantial problem will be the Anti-Sicilians (but these can be fun to play; what is not fun of course is people consistently avoiding your Dragon). Re the Yugoslav attack try sth offbeat for starters and use the spare time to focus on the Anti-Sics.
My 2 c, Chris
P.S.: The reason I propose the Dragon (or to book up on the Pirc) instead of 1. ... e5 is merely the fianchetto feature.