Well the obvious way out would have been that the pod got sucked into the wormhole before it imploded; the ending to Prophecy certainly left that option open. He'd then have been a captive of the bugs; for a brief period its plausible that he'd survive that intact, but the length of time star solider talks about? Chances are even if he physically survived it wouldn't be Blair anymore.Mark Hamill not dead, Luke Skywalker....Physically? Spiritually? Force Ghost? Who knows....Star Wars can change anything and have it believable. Blair? For the sake of saving pretty much all of humanity, AGAIN! hmm I'd say he's dead, I mean how would he have survived? the wormhole went Capooyow! He went out like a champ tho.
Blair ended up becoming a lootbox seller on the Nephilim homeworld, destroying their empire from within.Given how EA has pretty much abandoned the IP, it is whatever we say it is until they revive it. (It'll be a horrible lootbox laden micro transaction live service mess though going by current EA releases)