Not necessarily altcoins but half baked projects and redundant projects with no value to offer. The crypto industry and market has been littered with these kinds of projects bringing about a loss of interest in most altcoins and attention shifted to the other bigger and more stable cryptocurrencies. It is quite understandable that people will lose interest in some crypto projects.
Very nice point mate, too many baseless altcoin projects already yet we still face scalability issues and other drawbacks hindering blockchain/crypto mass adoption. Imagine some new projects copying Whitepaper, what then can such a project offer? Such projects over time will be extinct since they add no value. Some good altcoin projects like LINK have been really cool with development, hence can't be boycotted.