23andMe tells people how much Neanderthal ancestry they have. How soon will they be able to measure Denisovan ancestry? (That is assuming that “anatomically modern” Homo sapiens and Denisovans got together and made babies.)
It's being done now. Pacific Islanders have the highest percentage of Denisovian DNA today.
They recently found a skeleton 'fragment' that indicated that person had a Neanderthal mother and a Densiovian father.
Startling Discovery: Ancient Mixed-Race Girl Had Neanderthal And Denisovan Parents
"[The sample was from] a hybrid daughter of a Neanderthal mother and a Denisovan father. She was nicknamed Denny. “If you had asked me beforehand, I would have said we will never find this, it is like finding a needle in a haystack,” Pääbo told Nature."
I used Ancestry dot com for my DNA, and they weren't doing that for customers in 2017 -- but they had a link to an archaic DNA project, and my Neandertal DNA was accompanied by Denisovan DNA, which really, really surprised me.