Not looking good for F1. I don't follow costs much in the sport if I am honest, but surely these new engines have something to do with why these new teams are in administration or on the verge of.
The new power units have indeed increased costs.
Maybe there is an additional issue - sponsors are losing interest in teams, who are struggling in this new era. As we remember, before 2014 many teams said it would be the "make or break" year for them. But there are different aspects for this question. For top teams like Mercedes to rise to the very top - had they failed, maybe the Merc HQ's would have pulled the plug or at the very least viewed their funding differently. But for several smaller teams it was the matter of survival. Success or failure in adapting to new sets of regs could motivate investors to either further believe in this project, or not.
Interesting that in 2009 also several teams pulled out - this was also when we got a new set of regs, but pull-outs were more due to recession and by car manufacturers (BMW, Toyota). But also before 2009 we heard that season was going to be a very important year for several teams to either "make or break".