There is a huge "?" on how, when and if graphene will become a viable substitute of silicon for chips. There are thousands of other problems for a graphene based chip. Moreover, Moore's law is valid for graphene as it is for silicon. The big deal would be heat, if graphene will be able to produce cooler processors then there is a great chance you will see graphene based computers in couple of decades, although it will be really hard. Anyhow, studies on new materials such as graphene are essential for technology evolution, and even if I'm a bit sceptic on graphene's use in transistors in the near future, I'm sure there will be a breakthrough in (energy or computing) technology thanks to this material :-)
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Any new technology always seem really difficult in the beginning. The silicon industry faced similar problems at the beginning too. Lot of "?" as you call it but with time and money poured into it, more often than not, it becomes a reality.