Right now it seems like the massive boom in icos is fairly unsustainable if every new venture or product has to try and establish an ecosystem to justify the long term existence of their coin or token.

Unfortunately as far as I can see the massive fundraising potential of ICOs is only possible due to the speculation value of coins being listed on exchanges and increasing in value.

In many cases the new token isn't necessary to the model beyond the initial fundraise. So what I'm wondering is whether there is an ICO model that preserves that speculation value for backers without requiring the long term success of a completely new ecosystem?

Hope this makes sense and isn't too rambly,