I will say, they talk about how defensible the village is, but it seems like most of Senku's Kingdom of Science stuff is located OUTSIDE the village. So it seems pretty vulnerable.
I'm sure Senku was planning to get around to it when it became part of the build order, but his surprise was that Chrome went out and did it on his own.
I honestly think that at some point, even Tsukasa is going to switch sides. Because he feels very much like a "first arc" villain, and not a big bad for the entire series.
Tsukasa's idea of civilization is honestly really dumb, and he has a "might makes right" mentality. And I think once he's beaten, he'll just join up with Senku. Because he already likes and respects Senku, and is only his enemy because their ideas for civilization are incompatible.