Right now for me, it would be worth it. I'm on a mid-2011 13" MBA and still rock solid on Sierra, so over the course of the last 10 years it has more than paid for itself; effectively it has been $160/month for the past 10 years. If I can get that good of a performance out of the Silicon MBP, I'm all for it. And that's not even getting into features of the new hardware.
If I compare that to the alternative: my wife went Dell Inspiron and Dell Latitude for two laptops, and both died 4-6 weeks after their 2-year warranties expired, then went for 11 years with her 2008 15" MBP before getting the 16" 2019 MBP.. the reliability and durability is worth it. Hell, I can even compare that to my Apple IIe, which will be 40 years old next month and still runs. That's $2.90/month that I'm still getting a killer game of Karateka, Spy Hunter, Zaxxon, and many others on.
But I digress.
When I look at things over the long run, I've already paid the Apple Tax for Sandy Bridge, and it is still running (I'm making this post on it). If I can get just as long if not longer out of M1X or whatever the next Silicon is going to be in the MBP, that will be worth it.
BL.