Kinda looks like a venetian blind in search of a window...
Here's my concern. There's less breeze on a sailboat, not more, because, well, that wind is pushing against you. Making you move. Etc. So what keeps that thing pointed at the wind generating power? And how "off-shore" is it gonna be when you need to, you know, plug it in for it to be worth bothering with?
Just one of these arrays, says WCS, could offer double the swept area of the world's biggest conventional wind turbines – the 15 MW Vestas V236 – and its smaller rotors could perform much better in wind speeds over 40 to 43 km/h (25 to 27 mph), when larger turbines tend to start pitching their blades to limit production and protect themselves from damage.
Sure - a windmill array taller than the Eiffel Tower and wider than the Symphony of the Seas is not going to lack for swept area. It's not gonna lack for unswept area, either, which is what Mama Nature uses to push you over. Its unswept area also appears to be greater in the direction perpendicular to the wind, too... which means they've gotta be pretty actively turning that thing into the weather or shit's gonna get exciting.
Surmountable problems, I'm sure... but I'm not sure I'd want to take them on. We're dealing with megastructures already.