wtvanhest, not that I know of. It's hard to collect good usage data without nagging people. I hear from small business owners, the occasional accountant, and I have the impression there are other business/institutional users that don't interact.

Distant future is hard to predict but here I go: hledger or any good parts of its design are still around and still providing value. Any past data kept with hledger is still readable and easy to convert, with or without a working hledger. Highly polished and efficient UIs are available everywhere they're useful. Data import and multimachine syncing are routine and just work. Data hygiene/security and personal privacy are routine and just work. Performance is high, "big data" is no problem. Resource usage is low, these tools continue to work in the turbulent and resource-constrained future. There is a strong global community of financially literate, capable, empowered, prospering individuals and organisations using efficient high quality universally available accounting tools to promote, enforce and create widespread transparency and societal insight in finance, business, politics and every ecological issue.