So you're complaining because it hasn't happened in the past, so you're assuming it will never happen in the future? You should just stop following football, you'll never be happy.
It's not even like Man U's previous transfer strategy didn't contribute to a reasonable amount of success.
Yes they need to strengthen, but they've done it in the past, why assume they won't again?
You're just complaining because Moyes has basically said that he doesn't expect to be able to sign the sort of quality that he's after in January. Which is normal, most sane people know that it's hard to get quality players in January, for the reasons I've already given.
He's not saying he won't sign anyone, just that people shouldn't expect 3 world class signings then.
Didn't Man U sign Vidic in January? So you can get quality and they'll know that, but you have to identify the right targets (even more so than you might during the summer). That's all.