In this current situation of Tottenham, sacking this current coach and bringing in another one is like taking a painkiller just to subside the pains, but the problem are still there. Look at the players of Tottenham, how many of them can get into the Arsenal team?
That shows how weak or average their squad is, so a new coach may do a short term magic, but he will still be sacked next season when the team start showing their true colours.
But at least it could save Tottenham from a much worse situation as Tottenham's position in the standings is quite precarious. Furthermore, many Tottenham players are injured, so a change of manager won't be enough to fully restore Tottenham's performance. This will be complicated because Tottenham's problem isn't just the manager's poor performance, but also because several key players are currently injured. Some football observers say Tottenham are in a precarious position and it's difficult for them to get out of this situation, but I'm confident Tottenham can get out of this situation.
Tottenham can get out of this shitty situation with time when they approach the problem technically, injuries can actually distabilize and reduce the performance of a team since it's unpredictable to which players it would happen to. So It's not what Tottenham can do overnight and start getting results immediately, it's going to take a few seasons to get the team strong with depth quality and coach that can deliver with the material of players that would make the team and bring Tottenham back to great form.
They played just as poorly last year, even winning the Europa League final against Manchester United despite their poor performance, which is why they're in the Champions League this year. They finished in the top eight in the league, putting in an unexpectedly good performance. They might have to endure for a few years to return to their usual strong and challenging period in the Premier League.