I don't see it happening for two reasons.
1)They just released EoC, which was a major update, JaGeX has put alot of time and effort into the EoC and they made the decision to launch because they believe it will have a long-term, positive effect on the game/the number of players.
2)If the number of players isn't rising, I don't believe they will remove EoC because by doing that they actually prove themselves wrong and (a big part of the community) right, while they ignored us.
The idea of seperate servers sounds good, then nobody has to complain anymore.