Well not many of them probably watched Game of Thrones from episode 1, having got excited based on the trailer. I didn't even know GoT existed until season 2, and I consider myself quite a genre TV fan. Yet it grew into arguably the biggest genre show of all time. You're not going to be watercooler TV from episode 1, it takes time for this stuff to build. Even the first season streaming hits like OITNB and House of Cards weren't popular prior to release.
That's relative of course. STNG averaged 17 million viewers per week. GoT set a show record with 16.5 million for the finale. STNG's pilot had 27 million viewers. TV was different then.
I do agree with the suggestion DSC will get more popular over time. With the glut of genre shows available to watch, it'll take time for fans to warm up to a series from a franchise that's been off for a generation in TV time. I do think it will get there. I think it will be a critical success, and glossy enough to attract casual fans over time.
RAMA