Well, what if? Live the life He commanded and who cares? What if He was warning non-believers rather than us and why would He warn, or even notify, us?
Part of living the life He commanded is obeying His commandment to know the season of His return and to continually watch for His return. Why would He notify us? So we could warn others, specifically non-believers, that the time that God has allotted for forgiveness of sin and the time that Jesus Christ makes Himself available for salvation is rapidly dwindling. Since the alternative to eternal life in Jesus Christ is eternal damnation and eternal separation from God, Jesus told us what would happen and when it would happen so that we could tell others.
"It is not God's will that any should perish". (2 Peter 3:9) We are notified so that we can notify others.