Honestly, 99.5% of altcoin are not scam but rather more than 60.5% are genuine with great potential in my opinion. I also think that many altcoins besides bitcoin will surely survive. One of the essential elements to consider when assessing a potential ICO scam is the individuals behind it. A robust initial coin offering will present potential investors with a detailed team breakdown, listing founders, developers, advisors, security experts, and anybody else associated with the project.

Again,a white paper is the most important element of any initial coin offering. In a white paper, an ICO will present an outline of what it plans to achieve, a breakdown of how the technical aspects of the platform function, and delineate its token distribution model.
If an ICO doesn’t provide a white paper, then it’s undoubtedly a scam. Simply providing a white paper, however, is not a clear sign that an ICO is legitimate. Some fraudulent initial coin offerings pay online freelancers to write up hilariously bad white papers under the assumption that providing a PDF white paper document is enough to fool most investors.

Initial coin offerings will generally provide potential investors with a detailed list of what they have achieved thus far in the development of their project, as well as what they plan to achieve, in the form of a roadmap. If a project doesn’t provide a roadmap at all, then it’s highly likely that they don’t have any plans for the future apart from “exit” and “profit”.
A roadmap should be realistic. If the ICO that you’re assessing hasn’t yet developed a working platform prototype or any code at all, then it’s highly likely that it is an exit scam.