I think so, though just about every time I watch it I usually come up with a new conclusion.
It may also be possible that he recognized that as technology advanced that a sort of interlinked hivemind was inevitable, and he simply attempted to control that mind.
If Lain was the God of the wired, she was a somewhat lazy God, generally choosing to observe rather than participate (much like her IRL self). If Erie could control her though, he might have been able to get her to do more than just observe, since she obviously had that ability.
Theirs also the KIDS system though...as well as Lain's sister, her father and his likely connections with Tachibana labs, an alien that may or man not have been (part of) Lain, and a million other loose ends.
Honestly, I can't say for certain what any of it was about, just guess and conjecture.