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It's not just FMRI - what about blood tests looking at gene expression, computational methods, tissue engineering, and stuff that hasn't been invented yet? Regarding ICSS though, I've had a look and I really fail to see how this technique is benefiting humanity..? For example they've discovered more detail about where cocaine affects pleasure/reward neural circuitry - so what?

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The point wasn’t FMRI per say, just that it would limit the science to observational studies like FMRI, which cannot reproduce the results of things like ICSS. Also such research may have large implications for understanding and treating addiction. The first step is understanding it.

As far as I know we already understand quite a lot about the neurological basis of addiction. Some treatments already exist but the main problems with them are social & political ones. Discovering better drugs would be really useful, but this can & is being done computationally. In addition, such research may also produce techniques for creating addictions & otherwise more effectively controlling human beings.

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