Sure about that? Consoles not only appeal better to the mainstream, for they are utterly cheap and (mostly) without maintenance. I would think console gamers are in the majority, by far. There is also the piracy issue. What, 40% of all games are pirated?
Grand Theft Auto would be an even sweeter title to target, so Rockstar has motivation to keep the PC version as long the shelves as possible.
This isn't even mentioning the fact Rockstar is working with a totally new game engine in IV. They took a year each to get 3 subsequent games to the market, and they were all using the same engine, in stands to reason this iteration might take even longer than GTA's of the past.