In practice, I suspect the entire category will be folded into Claude Code and Codex (Anthropic is already trying with Claude Agents), and that will do 80% of the job at 0% of the cost and configuration effort.
External programs will still be useful for the tiny minority who wants different harnesses for different projects, but yeah, tiny minority.
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in my experience, tools usually have a longer shelf-life than models/labs. e.g. terminals and IDEs have been around for much longer, and people tend to stick around with their preferred IDEs for much longer (years/decades).
One bad cycle and the next Opus 6 or GPT 7 might flop (think what happend to LLama4 or Gemini), and the user quickly switch to the next best thing. So it make sense to build your tooling to be model-agnostic.