Allardyce has either met or surpassed pretty much my expectations when we made him manager. In fairness the one area where I have been surprised is in the players purchased. whoever was behind buying the players, both Tosun and Walcott have been good buys in my opinion, in so far as they are better than the players that we had in situ, and have improved team performance.
However my expectations of Allardyce are that he will still buy players to suit his safety first ideology, and that means tried and tested, most probably with experience of fighting relegation battles. It will be out with the young and in with the old. If he is still here we will definitely see Lookman leave, and most likely the likes of Vlasic, Holgate and possibly Dowell too. At the end of his stint (assuming he stays the full 12 month term which I very much doubt) we will have a very old squad of high earners that we are going to find very hard to move on, and we will have lost some of the best young players in the country. We will also no longer be an attractive proposition to other highly rated young players.
That is the lasting damage I expect from him because it is exactly what he's done at other clubs he's "saved from relegation". When he came, many argued that he would be different here. Well he hasn't shown it so far and I don't expect him to either.