I went in 2014 and 2017. The missus went in 2006 with her family, 2014 with me, and again with her family January this year.
Similar thoughts as above. English is not a problem in the hospitality areas. Hotel front desk staff speak good english from my experience. Restaurants/bars, particularly walking street, generally not an issue either. A lot of places will have an English menu. I didn't find taxi drivers having very good english but can get by with simple words (airport). To simplify transport communications, we used Uber in Saigon but they recent stopped operations. Recommend installing Grab (which we used successfully earlier this year in Bangkok where Uber also stopped operations). (And if you do use a taxi, I'd suggest trying to ensure it's a Mai Linh or Vinasun to reduce the risk of funny business.)
+1 wrt to french as a potential language option for some older residents.
In the span of the 3 years I went, I could notice things changing. But the missus can't believe the pace of change over the 10 years from her initial to most recent visit.