I think I have to agree with what Denis is saying...besides, I actually think i'd rather be sat at a desk in comfort, then jiggling around trying to get comfortable with a big heavy gaming laptop on my lap. I'm also not overly fond with not having a mouse or 'proper' keyboard (With the indents in the keys). I find typing to be quite difficult.
Another problem I also come accross with my mums laptop is that unless you're charging it nearly constantly, you'll run out of battery quite quickly..which I find really irritating, because i'm constantly having to give up system performance to give more battery life. I also find that my lap tends to feel as though its on fire, because it gets awfully hot too...
I also like the idea with Desktops that I can at least upgrade parts when I need to...on top of the fact that you can't really do that with laptops, the price of them is rediculous in comparasin to the cracking hardware that you'll get in a desktop for the same value...
Overall, i'll always have desktops I think
And whilst the Laptop is handy if you need to check things on the go, moving around the house, they're not really built for gaming I don't think...yeah sure, you can get gaming laptops, but I just don't think they're very comfortable either to play on. As in, the general experience. From the overheating to charging, or just how awkwardly they sit on your lap...
Jack.