It depends on the situation. I've had a character in the past who recruited as much decent Cavalry as he could command as a Cavalier. I now have another character that recruits as much good Cavalry as she can (Although, granted, she's still new-ish and thus has lowish Honour). The latter would make a perfect Cavalier, which she will soon be. I say there's still enough opportunity around for the Cavalier class, beyond the RP value.
