I am strongly against the idea of closing questions as "too basic", if it is in the sense that the question is an elementary result in the field, or in the sense that the question has a simple solution. This is for two reasons:
- Who's to decide what's "too basic"? Among those $\geq3k$ users who can vote to close, there are professors of mathematics and physics, and I bet also some undergraduate or maybe even high school students. What's trivial for the former might not be so for the latter, so whether a question gets closed depends strongly on who's reviewing it, adding a strong air of subjectivity which I do not think is appropriate.
- We are not MathOverflow, where only professional mathematicians dwell. There are people from all levels of mathematics that can benefit from the site. If we were to require that questions not be "too basic", many otherwise valuable questions will be lost. Even if these questions aren't valuable to you, they may be to others.
However, I can see why you might want to close it if the question is not "too basic" in the above sense, but rather the "one Google search away from the answer" sense. In this case, I don't think the problem with the question would be that it's "too basic" per se, but that the questioner hasn't shown any research effort. But we already have a mechanism to deal with this: close as lack of context! Furthermore, it's quite possible that a beginner has a question about a concept but doesn't know the proper terms, so all of his attempts at googling turn out empty. In this case, even if the question is basic, it doesn't lack context, and I honestly think that it will be a good question for the site. Not only will a good answer help the questioner, but also future visitors.