Yes. probably 64 bits will only come back after the porting of the game to Unity 5 - IIRC, Unity 4 have some bugs not fixable by the devs/won`t allow debug access to the relevant parts of the program causing the 64bits issues.
Most mods stopped supporting 64 bits for a while, and the new 1.0 build have a way smaller footprint on RAM (besides that, you can use active texture management mod for a heavily modded install).
I.e.: you won`t have any performance drop from a hipotetical 64 bits to 32 bits, unless you install all mods at one lol.