Something needs to be done, but, the 128 players offers a new dimension to possibilities and we shouldn't be thinking in the old 64 way.
The old 64 is "get the action going", but in 128, staging a massive attack is something what 64 cannot offer (and that's what everyone liked) - what the devs should do is to get that massive attack going smooth (larger flag zone for instance) instead of having awkward grenade spamfest at flagzones.
Adding flags is simply unnecessary, and most maps do not need an increase in vehicle amounts, for example: crete is something that needs a little bit of work (adding Ju, less TK on airfield) but the original map is too big for 64 anyway.
Maps like Alam Halfa hardly need any modification.
One thing that must be done is please limit the grenades, the rifleman should be somehow limited in some maps so the SL would be using the SL kit, and a guy would be using the MG kit, and that is 2 less grenades (and 2+ less riflegrenades). And scout kit should be somewhat limited as well so there aren't insane spam of smoke. The limitation should hardly be noticed if a team don't go extreme in nadespam.
If the 128 code is somehow released, there should be consideration of introducing more alternate weapons for spawn, let's say a sapper loadout for engineers in the desert.