Their views are just going to get worse for a few reasons.
They don't want to try anything new, they are now only doing pampered things, even with nannies the children are going to get more in their way, people are getting sick of these vloggers and everyone is noticing how they are all gross slobs and gluttonous pigs, new and younger vloggers will know how to attract viewers better.
I am sure they can always make a living from their channel but it won't be the lifestyle they are having right now.