The reason why the old system doesn't work is because of the leeching mentality and because the drops are pure garbage compared to Abyssea. Even @80, most of the Walk drops were either directly in competition with Vision drops or were minor sidegrades.
Reservation gives pick up groups and linkshells the ability to bring into the run who they want and work out distribution the way they see fit without distractions from lone wolves.
The problems with current WoE is multi-faceted and in need of significant adjustment. Monsters need to be susceptible to enfeebles like Sleep, Bind and Gravity, boss monsters need to stop randomly patrolling unless they follow obvious patterns and coins need to be equivalent to old-Dynamis currency in frequency of drop rates.
Reservation beats randomly smashing together people every time. If you're planning a run of randoms, I don't see why you simply cannot reserve the chamber and do what you do now.