It remains to be seen whether this will help or hurt the WP community. In the late 1980s and early 1990s there were dozens if not hundreds of Word processors and Desktop publishers.

Microsoft used it's dominance to bundle Word with Windows for the purpose of destroying those other word processors. Word was (and still is) a mediocre Word Processor compared to the competition - and it destroyed the Desktop Publishing market. But it's now the standard, like it or not - and there is no word processor market.

The truth is regardless of the stated intent or desire, Gutenberg will destroy Fusion Builder, Visual Composer (i.e. WP Bakery) and others. For those two and a few others, that's a "Good thing", they make it too easy to create monstrosities. They are bloated. They cannot be removed once inserted.

Most page builders will not be financially able to support their customer base, and so thousands of users will be left without an smooth upgrade path.

The question is will that destroy the WP community or help it. It could go either way. The pain of the upgrade may drive them to Wix -- or will they weather the transition to a unified Gutenberg world - where WP is ultimately less bloated and users aren't trapped into annual license fees per domain. The Gutenberg world, will (probably) be better than the current mess of page builders. Getting there is not a sure thing. But it appears to be a risk worth taking.

The opportunities to transition from the other page builders to Gutenberg abound. If a developer can automate some of that, there's some nice profit to be had on the consulting end of it. But most WP users don't have huge budgets, so you have to find a way to be efficient.