What year do you think will be The Sims 4 last year before its no longer being developed for? Sims 1 2000-2003 Sims 2 2004-2008 Sims 3 2009-2013 Sims 4 2014-20??
Seeing latest interviews I'll give them 10 years. Afterwards I'm not sure it'll be rational as technologies are developing so fast it'll be completely outdated by that time.