I don't want you to be wrong, but your reasons, "betrayals" etc. have no sense and no place in real world, especially football. He'd, as 99% of other players, "betray" Everton for f.e. Atletico Madrid, Dortmund or Juventus for more money and playing time. These are huge clubs and what's even more important, they're miles better than us at this point. It has nothing to do with history, who Koeman is and similar other things. He's trying to get himself in a best position. I'm sorry, but you're not being realistic at all.
Evertonians as a whole underestimate just how big a name we are too in the eyes of others. We should be proud of our heritage, history and stop assuming we're a small club cos Rafael Benitez says so. We're also huge imo. I am being realistic imo. Everton have won two titles in the last 30 years or so the same as Atletico Madrid. Dortmund have won the same number of domestic titles as we have. Everton are on a par with names like Napoli, Atletico Madrid, Valencia and lots of other 'huge clubs'.