The only problem with that is the quality vs quantity conversation. You write a book. Or two. Three. Twelve. However many you need to. Are every single one of those books going to be up to par?
Honestly, probably not. Personally, I know mine aren't. As I've been letting a couple of mss sit for some time before undergoing another round of revisions, I've gone back to read some of the older stuff I've written. Oh my holy ... it is almost unbelievable how much my writing sucked. Of course, I've also discounted these previous works to the realm of my quantity pile. My quality pile is far smaller and much better and was written more recently.

So as I seriously consider putting aside one of my wips, I wonder, what's caused you to shelve a project? Is it still sitting up there, or have you since dusted it off and started the rework?