I don't think it will.
When Jagex Released Runescape 2, after they finished Beta testing for it; they maintained the older version for all players that wished to continue playing it: Runescape classic. They didn't just force everyone to adapt, they allowed for the community to gradually and naturally adapt and change to the newly released content.
Doing the simple actions above would of helped jagex maintain tens of thousands of players, also, why didn't the implementation of EOC earn a vote??.
Thing is, i don't believe Jagex cares for 07scape to succeed, if it grows - and it easily could (baby steps, add f2p worlds), rs3 would lose momentum and that would really shatter their incompetent egos. It would without a doubt prove that RS3 sucks.
But hey. Am just a jabroni on a cheating site lol