I have been watching F1 for 50 years (yeah: do the math) and I have never experienced boredom such as I have suffered in the last few years: yes, maybe since Vettal dominated. They are not going to bring in a younger crowd with the product they are airing now. Get rid of Bernie. The sport needs new blood managing it.
This year all the races have been excellent or at least very enjoyable until today, and for different race, some were full of action and incidents, others were great tacticle battles where the smallest of errors would be decisive. Today was just a poorly designed circuit, especially in combination with Mercedes power and DRS.
Of course the Mercedes domination is a problem, but the end is in sight and their drivers are always prepared to bottle it or just beeing immature and silly. Vettel had only one and half season of domination, two of his titles took an excellent drive in the last race and in the other two seasons it was more about others in competitive cars messing it up in the end than the RBR beeing unbeatable.
The biggest change in F1 is the fact that the teams and engineers run the sport now: they determine the winners basically. The drivers have been made to be second class. I believe this has contributed to the drop in viewership.
It's quite obvious who Mercedes wants to win the WC but they are not fully in control, they just help a bit. And it has always been an engineer's sport, only if the car is within a small margin of the best car, a driver can make the difference, and only a few really do.
The past is always romanticised, but in the eighties and large parts of the nineties and 00's it wasn't as entertaining as it is now.