Sadly this is true in almost every conference. The Sangamo has dropped off and is just MF and Williamsville, everyone else has dropped off the last few years.
Illini Prairie is more competitive because they have 4 (BCC, Unity, SJO, Monticello) but Pontiac, PBL and PC are way behind those 4.
HoI is EPG, Tri Valley in the big and no one else. Eureka is respectable but no real contenders. The small is fun because it's more competitive but always seems to be 1 team much better than the rest.
The TRAC seems to have a charging of the guard and Princeton and Newman aren't as dominant as they were not that long ago.
It's definitely true in the ICE. It's Wilmington n Coal City and nobody else. Manteno and Peotone are decent, but not real contenders. The rest of the conference is cannon fodder