There will be, indeed, a "restoration of all things of which God spoke through the mouth of his holy prophets of old time" (Acts 3:21), including elimination of sickness and pain, even death (Revelation 21:4) - all things suffering humans yearn for. To some people it's fulfillment may seem delayed but that's because they expect the fulfillment to occur in their lifetime. But, really, has God revealed his timetable to anyone?
It is for our own benefit that God has not, lest we be accused of serving God only up to a certain point, in which case it will not be true faith. No, God has not revealed that date, not to anyone -
Not even to a "very desirable man" like Daniel (Daniel 10:19). He would not have the satisfaction of fully understanding and seeing the fulfillment of the many prophecies - including the Seventy Weeks of Years prophecy for the appearance of the Messiah - which God has prophesied through him: “And as for you, O Daniel, make secret the words and seal up the book, until the time of [the] end." (Daniel 12:4)
Rather he would have to wait and sleep in death and wake up at the end of the days and be resurrected to get that satisfaction. At that time everything would have been accomplished.
Daniel 12:13 “And as for you yourself, go toward the end; and you will rest, but you will stand up for your lot at the end of the days.”
Not even to that Abraham - that outstanding man of faith - and to other men and women of like faith.
"In faith all these died, although they did not get the [fulfillment of the] promises, but they saw them afar off and welcomed them and publicly declared that they were strangers and temporary residents in the land." - Hebrew 11:13
They waited for "the city (God's Kingdom) having real foundations, the builder and maker of which [city] is God" (Hebrew 11:10) not wavering in their faith.
Their faith was not dangerous. Rather, it was an inspiration and salvation for us.