With the whole automotive industry moving towards 100% electrification, it's easy to understand why Formula E is suddenly gaining more and more attention from manufacturers in favour of other series,; it's surely a good part of marketing for them in order to test new improvements and, in the end, to sell more electric cars. However, even with the ongoing technology advances, it will take at least 20-30 years for Formula E to even get close to challenging F1, in my opinion.
I'm not much of a fan of prototype racing altogether, but I think LMP1 could have continued to play an important role in racing if ACO had realised lack of competitiveness issues early on and opened up the regs a bit to allow more manufacturers as well as privateers in. As it stands now, the cars are too complex and expensive to be run by anyone other than factory teams. At any case, I don't think it's fair to compare Le Mans Prototypes with F1; one is built for endurance the other for sprint, it's two completely different racing cultures serving different purposes, in my opinion. Technically, LMP cars are not even single-seaters.
I personally prefer GT endurance racing due to more competitiveness and parity, more action, more varied grids and differences between the cars in general, more diverse engineering solutions and the fact that technology used is of much more relevance to road cars. Still enjoy F1 though.
I just wonder what happens with motorsports in general once ICEs get completely banned, as we're definitely moving towards it?...