If Geddy and Alex are playing, and THEY say it's Rush, then it's Rush.
Agreed. They were Rush without Neil Peart in the beginning. They can be Rush without Neil Peart at the end, if they so choose.
Frankly, I think Ged and Al deserve to make the decision about when Rush gets retired. Neil retired on them (understandable) and then sadly he got sick, and to maintain his privacy, it's not like Ged and Al could have done Rush then. Now that Neil is no longer here (RIP, legend), and enough time has passed, I think it is well within their right to decide how Rush ends, or continues.
For the love of God though, no holograms.