I wouldn't call Etsy market dominant, but perhaps Blue Apron would qualify -- I think it's the largest in its space. They have what, ~900 million in revenue? There are about 70 SV founded companies that earn that much or more in revenue, starting from AAPL on down to Splunk/Infinera/EFI, which are all hovering around that revenue range.
NYC may have fewer "unicorns" but NYC tech generally solves actual problems with shorter term realities of profitability sans VC slush funding.
Your opinion is really baffling. The impact on real world problems made by SV tech companies vs NY tech companies -- they're not even in the same universe of relevance. Look NYC dominates in publishing, in art, in finance. It's a great city. But it's a pimple on the butt of SV when it comes to tech.
SV is the giant sucking sound of the tech industry. More often than not a startup will be founded in a place like New York, Chicago or Boston and then move to SV to try to get VC funding. I think it has very little to do with the ‘culture of innovation’ and more to do with rich white guys willing to splash around money in seemingly longshot businesses. I guess maybe that is what innovation is all about.