Problem of trust exisits because any TOM DICK AND HARRY can start and ICO today and raise millions.... Since the regulators are still trying to understand bitcoin, the scammers take advantage..
While the above is true, this can be changed... Lets ask ourselves ? Why are poeple even raising money in ICO ? when the money is already produced on a computer (producing new tokens /coin).. I believe that the future may be where the new coins get created and distributed equally and then depending on their buy / sell activity (true merit of the project) - the founding team makes money since their holdings become more valuable - if people decide to hold or buy more... In that case, scams will not happen