Do you still need to validate blocks when you use a bootstrap?
This has been obsolete with the introduction of faster-synchronization. in 0.10.0. It will be slowed than using the client.
Why will bitcoin be gone? Won't there be a new way we can revive or keep it going? That worries me what you said now lol. So what will happen then? We just kind of got started.
Ignore that guy and his FUD, he doesn't know what he's talking about. Once Bitcoin moves away from ECDSA it should be quantum proof for the foreseeable future.