That's because the biggest paying video game demography were kids in the 90s who are now in their 20s-early 40s and nostalgia pays off big
you'll find most kids these days and young adults so 10-25 have far more assortment of entertainment, not to mention ever increasing social media fixation, youtube and instagram (which is for the old ones), not to mention the big mobile splash, VR and AR.
So those titles are probably the last of a dying era. who knows, I could be totally wrong.