I don't know if any alt can hope to be higher than BTC, not in 5 years at least. Yes, the ideas behind Iota are wonderful, but are they more wonderful than the ideas behind the current top 10 alts? OK, except Dogecoin of course. There is something today's prices tell us and this is that ideas are not yet the driving force. Look at Bitcoin Cash for example. The smallest in terms of ideas and they are number 3.