Intuit's focus is on the 35mil high revenue online returns not the 4mil low revenue desktop which is declining 5% annually anyway, and they're fine losing the latter as long as everything else they do is growing 10%. They're also cleaning house on ItsDeductible (only 100k users) and Desktop Basic edition so there will be a lot of churn between desktop and online and it will be interesting to see how it all falls out a year from now; but Intuit's $20bil behemoth will keep on trucking just fine, if not better.
For most users it's a choice whether to deal with Win 10 end of life in the next few months and keep their long-term tax process intact; or spend time changing tax process then still have to upgrade a few months after filing anyway.
