Imo yes but not from the beggining for sure, after 3-4 months of practise they will beat NiP and dominate whole world as they did in 2010 in CS 1.6. Nowadays in CS:GO is like 2009 when Na`Vi didn't exist yet. Wait some time, prepare popcorn and cola(or vodka) and enjoy watching ukrainians in the new game. It will be same as in CS 1.6, Na`Vi dominated all swedes and they couldn't do anything against them. so sad sweden :DD f0rest will be crying again and pray to God, to get some skill against Na`Vi :D So wait and we'll see whats gonna happen :DD
Na I doubt sourcers like the game since they only switched cause CS:GO is 2nd source and it is more active than Source so therefore most switched. Source didn't have many tournaments before so it was a good switch. VeryGames were the best Source team and what they are now?? ... I think they would love to play Source.
If they would end up being the worst team in Go i wouldn't be surprised. Those fancy old strats which a lot of teams learned how to play against won't work against teams like NiP VG or Dynamic. If they actually will put hours in the game maybe they will not lose as much as expected