This is me completely speculating, but if they have done away with trading all together it might have been because people started complaining about the Jawas not accepting their items. If you notice Jawas are no where listed on the map, on the site or in the times guide. It's supposed to be a fun surprise for SW fans when they go to Launch Bay, the trading is part of their character, they look for stuff, they barter and trade. As such they don't take just anything, so they are being true to character. Same as Kylo Ren won't hug, high five, or show any affection.
I understand people ad kids in particular might be dispapointed by this but that's when you can explain what the character is doing, they are being true to the movies.
I think it would be wise to find trinkets, bring them, but don't hype the experience up, or explain that a trade may not happen