First, you can TRY to buy a D60. Over at the Canon SLR forum there are a ton of posts complaining of never-ending waiting lists.Its not a stupid question really. There are many on this board
contemplating on getting a G3 even when they have a G2. If you
had just bought the Eos D60 in the first place it would be slightly
more
expensive than the combined cost of G2 and G3 plus accessories.
Second, once you have an SLR of any kind you need lenses. That $2K price tag is for a body. Spend that and you have a nice camera that can't take pictures.
So what do you do then? Buy a cheap $150 lens for that $2K camera? No, it's likely you'll get at least three lenses, and even if you stay with the consumer (non "L") type it's going to cost you $300 to $800 each! If you decide on pro lenses then that $2K is going to look like chump change.
Even if you already have Canon EF lenses, that 1.6X multiplier is going to make you want at least one very WA lens. Quality WA lenses are expensive, not to mention heavy. A Gray-market Canon 14mm F2.8L is about $1800. Of course you can settle for a 20mm (that comes to 32mm, only a bit better than a G2) for about $400.
The D60 and G2 address different needs. Actually, even if I had a D60, I'd still probably want the G2 for convenience.