The league being this open again is highly unlikely, which would make 'sustained' top four equally impossible until the stadium arrives, just by dint of the quality difference between a team which buys a nineteen year old like Dembele to fill a hole in the squad (and is willing to loan him out for six months and struggle on with just one striker) and a team which goes out and insta-buys Aguero, Sanchez or Lukaku because they can. And I will point out that we are still far too brittle and prone to draws/ avoidable losses: essentially, thirty-nine points after twenty-two games is still on course for about seventy points come the end of the season -good, but we've been here before.
And personally, I subscribe to the 'bird in the hand over two in the bush' philosophy here: I'd take CL or trophy this season over preserving this 'squad harmony' that would be so devastated by signing a readymade striker (and there is an equal argument to be made for the idea that having a squad so fragile in terms of chemistry might not be the best survival tactic either). There is no guarantee that we'd be competing long-term until the stadium arrives, so why not take what we can get this season and thus build a buffer against future disappointments?
Either way, mind, my expectations for Poch will increase next season: breaching the seventy-point mark is likely to be it, given that we got sixty-plus last time and are likely to get the same this season if we suffer a wobble. But if Poch fails to make those expectations, having a CL campaign or trophy to point to would do wonders when it comes to giving him an easy time for failing to deliver.
Also, thank you for using 'I couldn't care less': people unthinkingly saying 'I could care less' is one of the banes of modern existence in North America, I think.