I think ‘is Ruby dying?’ is little more than a meme that has stuck around for longer than it deserves.
The continuing work on the language and its performance is impressive, but Ruby (and Rails) themselves have the honour of being stable, tried-and-tested solutions for rapid application development. Is it as exciting as the latest and greatest serverless lambda framework in Typescript? Not really. Is it a dependable workhorse? Absolutely.
At some point you might be successful enough to justify a rewrite into something else, but a simple Rails app will take you a long way with little effort.
The continuing work on the language and its performance is impressive, but Ruby (and Rails) themselves have the honour of being stable, tried-and-tested solutions for rapid application development. Is it as exciting as the latest and greatest serverless lambda framework in Typescript? Not really. Is it a dependable workhorse? Absolutely.
At some point you might be successful enough to justify a rewrite into something else, but a simple Rails app will take you a long way with little effort.