Replacing SRAM XO 10 speed parts in the future

I always get great advice here. The old SRAM XO 10 speed was a superlight system, but say I run the full gruppo on a bike (they can be had cheap) will I be able to find, for example a direct replacement for the derailleur?

I just noticed that the particular model I am looking at was discontinued 2 weeks ago. It was a $269 derailleur, but they are on ebay for less.

My question is, can I just swap out to a newer 10 speed version like NX/GX etc. They are of course much cheaper.

Thanks

So I could run a Force derailleur with the XO cassette?

Thank you for the wise response.

I have consistently gotten good advice here. Should I conclude that replacing 5 year old XO stuff will not be a problem?

From what I gather, the 10 speed stuff is all interchangeable, yes? I can run a cheaper GX derailleur? I looked at the XO cassette and it works for all 10 speeds.

Of course I am often wrong.

I will also be running 2X. I see the XO stuff on ebay. The XO derailleur is still $150 (new in box). That is less than the original price ($229) but more than most new stuff. I know the XO has really good quality materials.

Reviews are good except a lot of complaints over the price. Bashing it on a rock hurts.