No one knows what will happen in the future, certainly possible that Intuit will eventually exit desktop but I would think it's still years away.
TT Online/Live has about 35mil returns for $4bn revenue growing 8-10% whereas desktop is 4mil users for $200mil revenue shrinking 5% annually. Intuit made some moves this year to cut support on things they projected would have low users/revenue - Win10, ItsDeductible (100k users) and Basic Desktop edition.
Clearly Intuit are pushing towards online where the growth is, who knows the net effect of the changes this year on the desktop user base but it could take a step down to 3.5mil or less, we'll see in the earnings next year. It's probably easy decision to trim support around services only used by a few hundred thousand, but exiting desktop altogether for a few million users is a bigger move.
