Hadoop is popular not (only?) because of some PR-driven mania around big data. It is popular because it is an organic, evolving open source project that solves hard but common problems faced by a lot of companies in a variety of industries rather cheaply; despite being somewhat susceptible to the common pitfalls of design-by-committee projects.

I fail to see how the existence of other tools that solve different and/or narrower problems takes anything away from the success of Hadoop, let alone spells its demise.