Perhaps if you backed that up with anything at all maybe......

Trade kills the NF shop , trade generate tickets, trade kills the reason to grind.

If you look at the downsides of not having anymore trade, it is much worse. It killed of a good majority of players, it killed off the veterans who were waiting for their account only to come back and realize their crew was on a storage account, and can't be transferred. It killed off any new incentives to get a BB6 or CV6 because credit drop rate is so low (90% of the players in NF already have a 6, this just screwed the newer players). And in my opinion, trade does no hurt NF shop, there are players out there that have billions of credits, but don't have any money to buy anything from the NF store. So other players that have actual cash buys elites on the store, and sells them for credits in game. Trade has been a feature of NF for years now, and removing it made no sense. If tickets were the problem, it has been stated even in trade rooms that NF is not responsible for your stupidity if anything happens in trade room. If you decide to give someone your password and they stab your back and steal your crew, that's your fault. Taking away this feature made no sense and was just plain lazy.

Where did these players get "billions of credits"?

with a trading or playing CVs

Selling 100+ leveled crews? Selling sprite mods back in the old days? Probably hacking the game before the disastrous hackshield was implemented? I doubt anyone grinded to get 1,000,000,000 credits. I remember my old fleet leader making millions of credits from selling sprites, sound mods, and fleet logos back in 2010. We had enough money for 40+ HAs even though none of us in the fleet had a BB5 at that point in time. xD