Boredom is a common argument against immortality that is completely derived from pure speculation because nobody has ever lived long enough to experience that feeling of suicidal boredom.
I spend great portions of my life being bored. Never has my boredom ever interfered or had any connection with my desire to live or be immortal. It's pure bullshit to even imply there is a connection.
I would find it hard to believe there's a single human in all of history that would be bored if they found themselves living in present day. Especially now that we're in the Information Age, more and more boredom is becoming a conscious choice for anyone with an internet connection, rather than an inescapable circumstance.