tldr; No, I don’t think so.
Plugin developers are probably the most insulated from the effects of Gutenberg because it is a visual editor. There’s still plenty plugins can and will do that have ZERO to do with Gutenberg.
Of course, page-builder plugins are on the chopping block.
And, eventually, even theme developers will be forced to deal with Gutenberg as it morphs into a full site-builder.
But, plugin developers are safe, in my opinion.
You will, however, still need to learn Gutenberg. Gutenberg *replaces* the entire default post/page editor. That means, no more meta boxes (as they are today). Those will have to become Gutenberg blocks. There will be some backward-compatibility, but WordPress is strongly recommending you update your plugins. Which, you’d want to do anyway, so they’ll work exactly how you want.
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