Don't think he will last anywhere near that long myself. Drogba's a mess of injuries and already has a somewhat reduced role. Lampard I dunno either.
But as I said, it's not just that they're getting on, it's that they seemed to get in the way of revving up the Chelsea squad last season. I think that's likely to happen again with a new manager, but I suppose we'll see.
You have to be wary of players who feel compelled to pronounce their "full support" for the manager in interviews. Terry was all over doing that last season, talking about hunger and how he knew what was required. Big warning sign, just like when he spoke out at the World Cup.