I hope not, but still, that would be God's decision, not mine, and I have chosen to trust the decisions He makes. I am saying that God changes His mind at times. If you read
Psalm 89, you can find it there as well. "Lord, you promised .... but you did ......"
Things simply are not that cut and dried. So Jesus thought He'd return while some were still alive. Well, He didn't. In the same what, God's promises to David were not fulfilled in the way people thought they would:
“If his sons forsake my law
and do not follow my statutes,
31 if they violate my decrees
and fail to keep my commands,
32 I will punish their sin with the rod,
their iniquity with flogging;
33 but I will not take my love from him,
nor will I ever betray my faithfulness.
34 I will not violate my covenant
or alter what my lips have uttered.
And what had His lips uttered?
I will maintain my love to him forever,
and my covenant with him will never fail.(AW)
29 I will establish his line forever,
his throne as long as the heavens endure. (Psalm 89)
Him being David, obviously.
And since Jesus in another place said He didn't know the day nor the hour He would return, only the Father knows, it's hardly a stretch to simply realise He didn't return yet.
God is much more flexible than we think. In the end, the line of David will indeed be established in Christ. Jesus will indeed return, I believe. But the road towards the goal is not so predetermined as we often make it out to be, desperately trying to harmonize prophecies with reality.