Jesus ends verse 7 with the phrase "though He bears long with them." This seems to imply that God bears long with His people's cries for help. But this is not the sense. The pronoun "them" refers, not to God's elect, but to their oppressors, whom God endures far longer than we do. The Jamieson, Fausset, and Brown Commentary states: "[T]he meaning is, that although He tolerates these oppressions for a long time, He will at length interpose in behalf of His own elect."
Then, Jesus states emphatically in verse 8, "I tell you that He will avenge them speedily"! "Speedily" is probably another poor choice of words; it is better rendered "suddenly" or "unexpectedly." When God's tolerance of these oppressors has run its course, He will promptly act at the right time—"out of the blue," as it were—to deliver His people.
Then at the end of verse 8 comes the question that pertains to each one of us now, today. Jesus asks it at the conclusion of the Parable of the Persistent Widow, a parable promising God's faithfulness: “Nevertheless, when the Son of Man comes, will He really find faith on the earth?”
The implication seems to be that very few will have the strength of faith that Jesus is talking about. As the God of the Old Testament, Jesus, having looked into man's heart from Creation and seeing humanity's trajectory to our day, had every reason to ask if there would be faith at the end time! Even the Jews of His lifetime, full of Messianic fervor, did not have the faith He is seeking! Would even His chosen people—Christians, the followers of Christ—have saving faith?
Do we have this faith? What, then, is the evidence Jesus is looking for that will establish that we have the faith He is looking for? Some might view this "faith" as a powerful individual faith to move mountains or to perform some other great miracle. Yet, what Jesus is looking for are those who completely trust Him as God, and based on that trust, are living by faith according to God's revealed truth despite all of the pulls and pressures from the world.