I can see where your coming from...But to play devils advocate,it could be argued that the players are just delighted to see the back off Mourinho and they are just thrilled to be able to express themselves again.This positivity,the feel good factor and momentum might power us for the next 4-5 months...But come pre-season and come August,we need a manager who can take us to the next level by actually competing for the title.
As supporters we probably won’t be able to figure out if he can take us to the next level.Woodward and the board have to take a lot of feedback from the players and the staff...They need to carefully analyse his training sessions and his tactics before they can give him the job...
His commitment to play attacking football and his good man management skills are obvious.But are his training sessions on a par with the other top managers in the league?Is he tactically astute enough to compete with the Guardiolas,Klopps,etc next season?These are the questions that Woodward and the board need to answer before giving him the job full time...
Post-Mourinho euphoria may last a few weeks to a month, but after that, the new regime and the momentum therein settles down a lot.
Then there comes the point where the players both decide if they want to play for the new manager as well as whether they want to stay at the club.
Those that want out, and are worth anything in the market won't be around by the start of next season so they aren't really a factor.
Also, if Ole's done the job to such an unexpectedly degree, he can look forward to a bolstered squad in more of his vision than what we currently have.
I really wouldn't worry about crossover into 2019/20 in terms of downed tools. Sure it might be scary to find out if Ole can start from zero on a clean slate and do the job, but so many true giant clubs have gone that route and been rewarded for it that we're hardly in a unique or unprecedented position in seeing how it would pan out, and neither should we think we're above all that.