Deliver what?
They lost a key player from their last title winning squad in Costa and they never really recovered after he left. Their last winning squad is nearly broken up anyway. Hazard is the only world class player they have and he could be on his way. Alonso is crap as left back. Moses has gone on loan. Luiz and Cahill are in their 30s now. Courtois, Matic and Fabregas left. Pedro is another one in his 30s and has been average for two seasons.
It’s not like the past where they were changing managers but had Essien, Drogba, Cole, Terry, Carvalho, Cech, Lampard etc. All proven winners. More importantly a lot of leaders there.
Most of their last title winning squad has been broken up. A lot of those players won’t be showing the form they had back then.