Perhaps. But on the flip side the Moses era ended by the mid-1960's, which by now is over fifty years ago. There are a lot more reasons than Moses for why the idea of building new subways in NYC basically collapsed and still to this day hasn't been revived in any meaningful way.

For example there are reasons why the new 7 extension doesn't stop at 42nd street and 11th avenue despite that making perfect sense, and they don't have anything to do with Moses. The reality is that the entire process is just completely dysfunctional.