Wenger quite simply has come to the end of his tenure, the Club has become stale under his management, it is immaterial whether he continues to gain top 4 and CL qualification or even wins the FA Cup again, as a fan i want to see real accomplishments, not virtual ones and unfortunately much as i love the FA Cup it really is not enough these days.
Can you honestly say that under Wenger in the current era we are a good enough team to win either the CL or the PL, he has had 20 attempts at the CL of which we have reached 1 final and 2 semis, hardly a resounding success and in terms of the league it is 13 years since we won our last and in my opinion in that time we have only really challenged consistently once.
No other Manager at any of the top teams in Europe would survive this long on sentiment alone, ask fans of RM, Barca, Bayern, MU, MC, Chelsea or Juve for example and none of them would accept CL round of 16 or 2/3/4 in the league as acceptable under the same manager for so long even if that Manager had previously had the success Wenger did in his first 8 years.
Sentiment aside, of which i personally run out a good few years ago there is no footballing reason i can think of to keep him as our Manager any longer, i'd much rather a younger, hungrier and more daring manager took over even if it meant a few years of uncertainty or inconsistency
