I meant in general as " tournaments" UOL failed to win Finals for the past 5 splits barring they've been in two EU Finals but wasn't able to win them. As you stated 2016 IEM UOL overachieved beating TSM but losing to C9 in the Finals, correction they did win IEM Oakland so this is kinda weird now, but did lose in another IEM - Pretty much the IEM participation award.
Point is about UOL is that they're constantly in contention to win but rarely do.
G2 considering each player on the team are capable and if not over hyped (Zven/Mithy - Considering they're constantly in/on every OP top 5/ top 25) but sucks outside of EU does make them the EU TSM.
Like you said about G2 depending on the result after this year, G2 will need to make signings because it's obvious the current G2 are going to do much outside of EU.
Perkz - Keep, young(20 or so) and is actually improving/getting better when in the past it was mostly his fault when the team would lose.
Trick - Never liked his ganks/jungle paths, it was more just camp top try to get Expect ahead and flip a coin to see if it would pay off, VERY rarely do I see Trick gank/camp bot in which implies either G2 are running the ( Have the team work around the worst player(Expect) instead vice versa having the worst player work around the best player). If G2 are going to go anywhere these days camping/giving the early game focus on the worst player that doesn't do much and in my opinion has really bad team focus/TP plays( Worlds) doesn't help. However if G2 lets Trick go they need to find a replacement considering Trick typically gets his team the early dragons, kills and map pressure. My prediction is Bengi/Bang 2018 Spring ?
Zven/Mithy - Just seem like mercenaries for hire or Kevin Durant type of players. Not expecting them to stay on G2 after this year is up and down with, again depending on outcome with say Worlds. If G2 are eliminated again in groups I do believe they will leave for another " greener pastures".
Wouldn't surprise me if EU has only 1-2 GSW type of teams and 7-8 PHI type teams in the spring of 2018.