Well Dodge and Chrysler already made two door cars and succeeded very well because it actually looks like a dodge or a Chrysler (Viper, Challanger, ME 412, Crossfire)
Lamborghini made a 4 door car just to compete with the Panamera and the Rapide... thing is that the Panamera looks like a Porsche and the Rapide looks like an Aston but the Estoque doesn't look like a lamborghini, imo none of those brands should of made 4 door cars because they're werent meant to do it exept porsche which already has SUVs.
You said that if theres ppl to buy it then theres a point in making it... One problem. Rich ppl will buy anything from Lamborghini, Porsche or Aston because they're famous brands... it could be a Lamborghini cardboard box car, people don't really care, they just want it because its new and its a Lamborghini, you get what I mean?
Well thats MY opinion: Supercar brands should make supercars ONLY. PEACE!!!