An Ecclesiological Pascal's Wager
Yes, this is firmly tongue-in-cheek:
I believe everyone could and should be firmly convinced by the Orthodox Church's ecclesiological claims: that She is the One True Church founded by Jesus Christ. If an Orthodox Christian becomes convinced the Roman Catholic Church is that Church, then I'd counsel him to reconsider and read our theology. If at last he could not accept our Church, then he should make an ecclesiological Pascal's Wager:
If he is right that the Papacy is all it claims to be, he is not excluded; since Vatican II, and particularly under the current Pontiff, the RCC considers Orthodoxy a "true particular church" with valid sacraments and orders. The Vatican has a view that Orthodox, in a nutshell, are too dumb to realize we're really part of their church.
If he is wrong (as I believe they are), he is renouncing the true Church and apostasizing. As St. Theophan the Recluse said, "You ask, will the heterodox be saved... Why do you worry about them? They have a Saviour Who desires the salvation of every human being. He will take care of them. You and I should not be burdened with such a concern. Study yourself and your own sins... I will tell you one thing, however: should you, being Orthodox and possessing the Truth in its fullness, betray Orthodoxy, and enter a different faith, you will lose your soul forever."
If nothing else, weigh those two outcomes in the balance, then make your decision.
(End naughty jesting.)