In my opinon the tangle technology adopted by IOTA will be a must have for all cryptos in the future.
We have seen lots of problems in the blockchain right now due to scalability.
The IOTA team seems to be valid and they are working hard to make their project grow and useful in the cryptoworld.
I am not sure if IOTA may take over bitcoin but i am pretty sure that it will grow a lot in the next years and its rise will be related to the mainstream adoption of IOT technology.
I have personally invested some money in IOTA and it's definetely a good long term investment