For me the issues are quite clear.
1. We have signed too many players, who when bought, viewed us as a stepping stone to the elite ...... chiriches, vertonghen, dembele, paulinho, lamela, eriksen, maybe even chadli spring to mind. Therefore their attitude towards us and losing is probably going to be more fickle than others.
2. Ripping the heart of the English core to our team. We got rid of some long term players for more fanciable names and a 'continental approach.' the worst thing is that can you honesty say fazio is any better than Dawson (both have a chronic lack of pace), chriches better than caulker, paulinho better than jake, capoue better than hudd? The answer is a probable no to each, which is scandalous when it was said we were upgrading. It is also natural that the guys who left had more heart and care for the club. Whilst none were world beaters, they are all decent players who put in 100%
3. Point 3 would continue on this when it should be noted that our transfer dealings have lacked strategy or intelligence. Yes we have signed some complete duds but it's shocking how we keep signing players without pace, strength and sadly..... Good technique. Heart will take you so far but we have a very average squad that ranges from 5/10 to 7/10 for the most part - combine this with a lack of care and you can see why we are getting beaten up like a league 1 side when we play a good team.
The immediate answer would be to form a squad around dier, walker, rose, mason, bentelab, Carroll, Pritchard and a couple of new ones coming through. All of these have experience and could be good back-up or starters for us next season. Expectations are so low that poch would be given good time if he was seen to be building something along these lines. I would look to really promote the next batch as well and bring a togetherness to te squad.
In doing so, bomb these flops out and replace them with either proven quality (ambitious signings) or players with prem experience (the likes of Reid, Barry, Lescott, Milner etc)have been linked and would have been able to lead the younger players and offer genuine quality.
Then add to the squad with players who see this as a step up and an opportunity as this sort of attitude will rub off on others. I was going to put Stromboli in the lacking quality list but we haven't seen enough and his attitude looks first class so he can stay!
Sorry for long winded essay but there are a mixture of problems that stems from attitude and quality/suitability and it will take us a while to solve it - if poch plays his cards right e has an opportunity to really change this club and be afforded time to do so.