Synchros will not change anything. Just letting you know that fur hires, vamps and other tier decks came out much later than synchros. Synchros are out dated, lame effects and slow... compared to some decks duel libks already has. The tier 1 or 2 decks duel libks already has will still be tier 1 or 2 with synchros released.... nothing will change expect nonnmeta decks ...
Drastically? If there are any changes, they're more likely to happen slowly. From what I understand, synchros aren't even very well suited to the duel links format.
I think you all are wrong alot of synchro based archetypes have amazing field swarming and combos to maintain control of the board. Also we dont know what all is in the main box. We could get x sabers and dragunity's or we could get something terrible like fables and watts
Well it is a main box which can hold 3-5 new archetypes along with legacy support for older ones. 3-5 new archetypes that are synchro based along with the actual synchro monster is going to cause a dramatic change it is a whole new way to play the game.