You probably won't ever see characters that are their "proper heights" in GE:S multiplayer. This is because of two reasons:
1. Everyone would choose oddjob
2. The game is based on proper weapon selection and tactical surveyance of the maps, not on the character heights. That was a bonus in GE64 and worked with 4 players and your mates sitting next to you do you can enforce those "no-oddjob games". In online multiplayer, enforcement means restrictions, restrictions means that one lucky person is going to be oddjob, that isn't fair and is stupid frankly.
To sum it up, player heights just don't work in multiplayer games. I am not aware of ANY current multiplayer FPS game that lets you choose characters that are drastically different in height to each other. If there is one, was it successful?