It makes more sense to me in these days of ubiquitous encoding of in-band data that it would be easier to edit if we just used tabs and newlines. If you need a tab in your data, the standard could support either \t (requiring \\t if you need a literal backslash followed by a literal 't') or %09 or &09; or \x09 or something.
If you require escaping then you may as well stick with csv - better to have the character that needs to be escaped to be common enough that people will run into it during testing.
My actual preference is LTSV. Then all that needs escaping or encoding is a quote since a tab or newline inside the quotes is different from one outside the quotes. And I prefer encoding to escaping generally, since it's easier for someone else to come along and build a fairly naive parser.
