Well. I have Magni 3 and Jot 2. Note that Magni 3 hasn't gone away since Jotunheim moved in, nor has Vali 2. But with planars like your Arya (which I don't have), Jotunheim has more soundstage and detail retrieval than Magni. With all that said, for most headphones, Magni can easily be where you stop (I did pick up an IE Magni from B-Stock, and I think it's cleaner sounding than the 3. But Magni has the headroom (again, on most cans, the exception for me is DCA planars) for darn near everything, and it sounds great. But there IS more to be had with Jot2.
But that's not the question. The question is, is it worth it? Most of us get the upgrade urge at one time or another. I have a great friend who still loves his Magni 2 Uber, and has stuck with it since he got it. I got a bug and grabbed Jot2. We're all different, but there's ABSOLUTELY NOTHING WRONG with Magni 3 (or 2, or Heresy, or IE, etc.). Need does not enter the equation. Depending on where you are here in the Golden State, if it's easy for you to tote Arya down to Valencia, I'd do it. If you train up or down, the train depot is literally across the street, and if you're training from the north, you have a bus from Bakersfield that drops you off at the station, too. I'd say it'd be worth the trip.
I will say that Bifrost makes a huge improvement. But in general, if you say something is great, upgrading is a want, not a need. Big help, right?