I believe that many of the projects which are around today won't be around in one or two years from now.
Of course, both the crypto market and the crypto industry as a whole are very unstable. Projects appear, projects disappear. Of course there are those who keep afloat for many years. It all depends on the team and the community.
No, it mostly depends on whether or not the solution is needed. If you build something nobody needs, why should it stay around?