To prove this wrong even though I may have made this table a month too late after the Pokemon bloom I have taken the past 20 streams done by Holos and compiled them into a table. I've also included singing and Marikart streams as additional reference.
Holos with very inconsistent streaming schedules like Aqua are excluded.
Here's the takeaway: while there's no Minecraft or Pokemon trend happening as of now, if you think that Holos play nothing but the same crap everyday you'll just have to watch better Holos.