Hm, you may be right. I tried to find the article I'd read, and the only one I'm finding about low ratings is satirical.Have a link for this? I've heard neither of these things...
Also, yes, everyone should be forced to watch this show. It should be shown in school science classes.
EDIT:
You sure it didn't do well?
http://time.com/2846928/cosmos-season-finale/
Probably no deGrasse Tyson if there is a season 2, though: http://www.kdramastars.com/articles/29786/20140722/cosmos-season-2-bill-nye.htm
Host Neil deGrasse Tyson said that even if there is a season 2, he may not be the host.
"We're all flattered that people are thinking [about a Season 2] but it's not clear that this was the kind of content you want to rattle off one year after the next,"
"If some years down the line after my life has recovered, maybe. But I'd like science to be shared by all. If someone else came up and wanted to host it, I don't have any ego invested in the visibility that hosting Cosmos brought to me."
With Neil deGrasse Tyson not hosting Cosmos season 2, some fans have demanded that another famous scientist should take over the mantle as the host of Cosmos and they want Bill Nye, The Science Guy to be the host of Cosmos season 2.
Cosmos fans over at IMDB have discussed who could be the host of Cosmos season 2 and Bill Nye was the one who "won" against other great scientific figures such as Michio Kaku and Richard Dawkins.