I think that advancing technology and manufacturing techniques have pretty much caught up with THX to the point where is is relatively easy for manufacturers to meet specifications that were once "exclusive" to THX, and at more reasonable cost. THX does have some fine criteria for performance - the problem is that it is increasingly easier for those criteria to be met on a routine basis by most manufacturers. Most technologies are this way - high performance difficult to achieve in the beginning, and over time that performance becoming routine and less expensive.