Yes and no, he was teasing the audience.
He said that they will be around for a long time. Then he said, they already have been (for 50 years) and then he turned it around and said "but I don't mean like that. I mean tonight. We are gonna play for a couple of hours or so".
So, he teased and joked about the future, but ultimately only made the typical "this night is just getting started, we will be playing so much music for you!" thing that many bands do.
Having said that, I believe that thanks to Simon they'll still go on for a few more years. I can see something like 5 or so still happening. Maybe another album, tour and then a farewell/LOTB style tour to finish everything off.