In every game I've seen go F2P or Freemium if you prefer sub players get exclusive content and cashshop currency with their sub. If you don't find the game worth subbing to, then don't. It's that simple. That's what Free to Play gives you. You pay for what you want. If you want to not have to bother with it and continue along as you are, then keep your sub.
I think you need to realise 90% of the items in the cash shop are going to be aimed at getting the F2P players to spend cash on boosts.
Someone like myself who has multiple level 50s and does not need/want to level another character only has Operations and a few more WZs to look forward to, how is that worth $15 a month?