I do think that it is daft that F1 has focussed on Aerodynamics this year. If you want to increase the show, increase the mechanical grip available to the cars (wider tyres, new suspension geometry, unlimited (but cost capped for customers) engine development, new fuel mixes, active suspension, smart regenerative brakes etc.) These things will not only increase the spectacle and enhance the racing, but have serious relevance to road cars - thus encouraging the manufacturers to return.
Formula E is a perfect example. What amounts to no impact from the aero has a profound influence on the racing (there is some), the mechanics of the various engines and suspensions are the only variation between the cars and the racing is wonderful. Whats more, manufacturers have a maximum price that they can put on components. For instance, this year, a 'new' starter Techeetah (silly name, I know) has taken on the power train used by the Renault works team at a cost of about £500,000.00 for the year. A lot, but an order of magnitude better than the cost of a Mercedes Power Unit of about £20,000,000.00 in F1.
Now F1 has always been about total car construction, but it would help the Manor's of this world and level the playing field if cost caps could be introduced and an emphasis placed upon mechanical, rather than aerodynamic grip