You say Lipo and brushless will solve electric's problems?
I very much doubt it.
I'll wager it will be exactly the same as it is now with brushed and NiMH.
You will still have the "cell of the month" and still have the "motor/speedo of the season".
People will always want to find more speed, and they will do it by purchasing the fashionable equipment, regardless of voltage or whether it has brushes.