Not necessary. Martial is shite here, he is same shite in Spain too.
Most of these players are shite under Mourniho anyway, they are shite under Ole during the end of their first season too. They are only good with individual form of some of the players (mainly Bruno) over past 2 years, but larger has been shite as a team for many years. It will take alot to completely change this shit show from our currently overpaid and lazy bunch, definitely a lot more than just a few good signings a change of coach. In fact, we have changed alot of coaches and spend alot of money too over past 7 years, and we have made zero progression so far, after over 1 billion spend and playing under 5 difference coaches. Its not that simple.
I mean, in the past 8 seasons we've won the FA Cup, league Cup, Europa League, finished 2nd twice, finished 3rd once and 4th once. We've also lost an FA Cup final, a Europa League final, and made the semi finals of the league Cup twice, FA Cup once and Europa League once. It's hardly all doom and gloom. Go take a breather and relax a bit.
You are never that far off. I guess the difference is expectation vs what happens. If you expect bare minimum the club goes back to winning titles next season and will blame them for being a mess if we don't, then you're setting yourself up to just be pissed off as that isn't happen even if we spend 500m in one window and steal Pep Guardiola from Man City while getting Klopp to retire at the same time. Ok in that case maybe. But still. You have to be reasonable. No point bitching about the past, it's how do we rebuild.
Year 1 - Implement system, top 4 fight
Year 2 - address weaknesses from year 1, adapt system to make next step up. Comfortable top 3 finish.
Year 3 - make step up to be competitive with the best teams in Europe (the hardest step)
That's pretty much the standard blue print on how every rebuild should go. Hell, even Ole did the first 2 steps after the Mourinho disaster but failed on step 3 and we are back to square 1 because of the way he went about trying to take that step (a chunk of very short term signings and no play style/subpar coaching).
Funding wise, if you need more than 150m a year for transfers with one of the highest wage bills in europe, then you're doing it wrong.