Gallery after TS4 era

Yes, if somehow it helps EA generate some money. If it's just there and doesn't get people to buy packs and or content from Origin then no, servers are expensive. I think EA will look at if it is helping get more money or not. As I stated on another thread TS2's exchange ended because they had stopped selling TS2 and the exchange wasn't really generating new interest and profit for EA if they no longer sell the game.

TS3's exchange is profitable by generating new interest in TS3 and it's packs, because they are still selling TS3. It only makes sense to keep the gallery if they keep selling TS4 for seven more years after it ends like they have TS3..which helps pay for that exchange server.