They already have a single stack .45, the G36. I've been wanting that platform in 10mm for years.
Me, too SBS, but the G36 is famously finicky and not nearly as reliable as other Glocks. It's just different enough to not have the boring reliability of the other models. That, imo, defeats a lot of the Glock proposition.
Now, if someone would make a Commander-sized 1911 in 10mm at a reasonable price....